[¶ 1.] Circuit Judge David R. Gien-app, sitting for Justice Richard W. Sabers, disqualified, delivers the majority opinion of the Court on Issue One, which holds that Blenner’s loss of use rating should not have been added to her partial disability rating.
[¶ 2.] Justice Steven L. Zinter delivers the majority opinion on Issue Two, which holds that prejudgment interest on the permanent partial disability benefits runs from the date of the impairment rating and is calculated on each payment as it becomes due.
[¶ 3.] Judge Gienapp dissents on Issue Two.
[¶ 4.] Circuit Judge Gienapp delivers the majority opinion on Issue Three, which holds that the prejudgment interest rate is the Category C rate pursuant to SDCL 54-3-16(3).
[¶ 5.] GIENAPP, Circuit Judge, writing the majority opinion on Issue One.
[¶ 6.] This is an appeal by the City of Rapid City (Employer) and the South Dakota Municipal League Worker’s Compensation Fund (Insurer) from a circuit court decision and order affirming a decision of the Department of Labor in a workers’ compensation case commenced by Nelva Blenner. We reverse and remand.
FACTS AND PROCEDURE
[¶ 7.] While employed by the South Dakota School of Mines and Technology as a secretary, Nelva Blenner (Blenner) suffered a back injury. In 1978 she underwent back surgery to correct the problem. In connection with the 1978 back injury the physician reported a fifteen percent whole person impairment rating to the insurer.
[¶ 8.] After employment with the School of Mines, Blenner became employed by the Rapid City Police Department as a sergeant. The injury at issue in this case occurred while she was receiving training on a new weight machine on February 23, 1993. The trainer forgot to reduce the weight setting on the machine and when Blenner got on the machine to exercise, her lower back was immediately injured. As a result, she underwent two microdiscectomies in 1993 and a spinal fusion in 1994. After Blenner’s accrued sick leave was exhausted in October 1994 she resigned from the Rapid City Police Department.
[¶ 9.] Prior to the injury Blenner had received a two-year degree in general studies. Insurer agreed to allow her to return to Black Hills State University in January 1995 to complete her bachelor’s degree. Insurer paid rehabilitation bene*510fits from January 1995 through December 31, 1996, and also paid all of the total temporary disability benefits that Blenner was entitled to prior to her receiving her permanent partial disability rating.
[¶ 10.] Insurer had Blenner examined by Dr. Lee Ahrlin who found that Blenner had attained maximum medical improvement and gave a twenty-five percent whole person permanent partial disability (PPD) rating. Dr. Ahrlin subtracted the fifteen percent whole person impairment rating from the previous injury which occurred at the time Blenner was employed by the South Dakota School of Mines. This resulted in a finding that Blenner had a net ten percent PPD rating as a result of the police department injury. Blenner did not agree that the PPD rating adequately reflected her loss and petitioned for benefits pursuant to Cozine v. Midwest Coast Transport, Inc., 454 N.W.2d 548 (S.D.1990).
[¶ 11.] A hearing was held before the Administrative Law Judge (ALJ). At issue was the extent of Blenner’s entitlement to Cozine benefits for loss of use under SDCL 62-1-1(9) and SDCL 62-4-6. Three vocational rehabilitation expert witnesses testified at the hearing. One of the experts was called by Blenner and the other two experts were called by the Employer/Insurer. The ALJ rejected the testimony of Blenner’s expert. The ALJ found that one of the Employer/Insurer’s experts found a loss of earning capacity in the amount of eighteen percent and the other Employer/ Insurer’s expert found a loss of earning capacity of thirty-eight percent. The ALJ averaged the eighteen percent and thirty-eight percent to get a Cozine loss of twenty-eight percent. In addition the ALJ found there was a ten percent net medical impairment rating of the whole body. The ALJ added this ten percent to the twenty-eight percent Cozine loss for a total loss of thirty-eight percent. The ALJ also awarded interest on the ten percent permanent partial disability from the date of the rating until paid.
[¶ 12.] The circuit court affirmed the decision of the ALJ. The circuit court established the rate of interest on the permanent partial disability at ten percent.
APPEAL ISSUES
ISSUE ONE
Should the Department of Labor have added Blenner’s loss of use rating to her permanent partial disability rating?
ISSUE TWO
Should the Department of Labor have awarded interest on the permanent partial disability benefits from the date of the impairment rating?
NOTICE OF REVIEW ISSUE
ISSUE THREE
If interest is recoverable, what is the applicable rate of interest?
STANDARD OF REVIEW
[¶ 13.] The standard of review in workers’ compensation cases is well established. Davidson v. Horton Industries, Inc., 2002 SD 27, 641 N.W.2d 138. Under SDCL 1-26-37, when the issue is a question of fact the clearly erroneous standard is applied to the agency’s findings; however, when the issue is a question of law the actions of the agency are fully reviewable. Id.
ANALYSIS
ISSUE ONE
[¶ 14.] Should the Department of Labor have added Blenner’s loss of use *511rating to her permanent partial disability rating?
[¶ 15.] The ALJ found that the twenty-eight percent Cozine benefit should be added to the ten percent medical impairment rating. The circuit court affirmed.
[¶ 16.] At the time of Blenner’s injury, SDCL 62-1-1(9) read as follows:
“Permanent partial disability,” a loss of use of the body or member of the body which is partial and permanent and shall be determined by a medical impairment rating, expressed as a percentage of the effected body part, using the guide to evaluation of permanent impairment established by the American medical association, third edition, November 1988. In addition to the medical impairment rating as set forth above, the employee is entitled to receive up to an additional fifty percent of the affected body part if the medical impairment rating given does not adequately reflect his loss of use as measured by the ability of the employee to perform work in the open labor market and to earn comparable wages taking into consideration the employee’s education, training, experience and capacity for rehabilitation. There is a presumption that the employee has no loss of use beyond the medical impairment rating if the employee is able to return to his usual and customary line of employment, (emphasis added.)
This form of SDCL 62-1-1(9) was enacted in 1992, SD Sess.L. ch. 364, § 4, and was repealed in 1994. 1994 SD Sess.L. ch. 396, § 5. Blenner’s injury occurred during this 1992-1994 time frame.
[¶ 17.] The ALJ and the circuit court found that SDCL 62-1-1(9) allowed the stacking of the Cozine rating and the medical impairment rating. This issue involves an interpretation of SDCL 62-1-1(9). As a consequence our review is a de novo review. Davidson v. Horton, 2002 SD 27 at ¶ 17, 641 N.W.2d at 141. Our review of the evidence as it relates to this issue is based on the clearly erroneous standard. Id.
[¶ 18.] In Tischler v. United Parcel Service, 1996 SD 98, 552 N.W.2d 597, we held that under Caldwell v. John Morrell & Co., 489 N.W.2d 353 (S.D.1992), and Cozine there is an allowance of recovery to the full extent of loss of use; however, this does not authorize an employee to recover based on a medical impairment rating plus the employee’s loss of use. While Tischler was decided after SDCL 62-1-1(9) was repealed, the wording of SDCL 62-1-1(9) in effect at the time of the Blenner injury does not create a different result.
[¶ 19.] Blenner contends the wording of SDCL 62-1-1(9) mandates an automatic stacking of the Cozine benefits and the PPD loss. We find SDCL 62-1-1(9) does not mandate such stacking and the Cozine benefits and PPD loss would only be added when supported by expert testimony establishing PPD loss was not part of the Cozine analysis of Cozine loss. Such expert testimony is not in existence in this case, and the expert testimony relied on by the ALJ did not provide that the loss of use was over and above the medical impairment rating.1
[¶ 20.] When SDCL 62-1-1(9) provided for “up to an additional 50 percent of the affected body part if the medical impairment rating does not adequately reflect his loss of use as measured by the ability of the employee to perform work in *512the open labor market to earn comparable wages” it did not mandate stacking; rather the language was permissive and the word “additional” in the statute limited the phrase “50 percent.” Any other interpretation could lead to results mandating recovery of over one hundred percent. A construction which accords with reason is to be preferred to a literal construction involving a palpable absurdity. Rice v. City of Watertown, 66 S.D. 221, 281 N.W. 116 (1938).
[¶ 21.] The circuit court erred in stacking the twenty-eight percent Cozine benefit above the ten percent medical impairment rating. Blenner is entitled only to a twenty-eight percent rating in connection with her work related injury. Accordingly, we reverse the circuit court and remand for further action in accordance with this decision.
[¶ 22.] GILBERTSON, Chief Justice, and ZINTER and MEIERHENRY, Justices and LOVRIEN, Circuit Judge, concur. [¶23.] ZINTER, Justice, writing for the majority on Issue Two.ISSUE TWO
[¶ 24.] Should the Department of Labor have awarded interest on the permanent partial disability benefits from the date of the permanent partial disability rating?
[¶ 25.] Dr. Ahrlin issued the permanent partial disability rating on June 26, 1995. The ALJ found Blenner was entitled to interest on the PPD benefits from the date of Dr. Ahrlin’s rating to the date paid. The circuit court affirmed. This is a question of law and is reviewed by this Court de novo. Davidson, 2002 SD 27 at ¶ 19, 641 N.W.2d at 141.
[¶ 26.] We addressed the general issue of prejudgment interest awards in Johnson v. Shelly Oil Co., 359 N.W.2d 130 (S.D.1984) and Tischler, 1996 SD 98, 552 N.W.2d 597. We held that employees are entitled to prejudgment interest on PPD benefits. Therefore, Blenner was entitled to prejudgment interest on the benefits due under the PPD rating for the permanent injury to her back.
[¶ 27.] We must, however, determine whether that interest should be paid from the date of Dr. Ahrlin’s PPD rating on June 26, 1995. A resolution of this issue is complicated by the fact that Blenner was collecting rehabilitation benefits pursuant to SDCL 62-4-5.1 until December 31, 1996. Because Blenner was receiving rehabilitation benefits at the time of Dr. Ahrlin’s PPD rating, Employer argues that, under SDCL 62-4-6, interest should not commence on the PPD benefits until the rehabilitation benefits terminated. We disagree.
[¶ 28.] SDCL 62-4-6, as it existed at that time, authorized PPD benefits and rehabilitation benefits. It authorized the PPD benefits “in addition to” rehabilitation benefits.
For injuries in the following schedule, an employee shall receive in addition to compensation provided by §§ 62-4-1, 62-4-3 and 62-1-5.1 [rehabilitation benefits], compensation for the following further periods [PPD benefits], subject to the limitations as to rate and amounts fixed in § 62-441, for the specific loss herein mentioned, but shall not received any compensation under any other provision of this title, (emphasis supplied).
Id.
[¶ 29.] Although Employer argues that, under this statute, interest on PPD benefits should not commence until rehabilitation payments have ended, we see nothing in the language of SDCL 62-4-6 that war*513rants that conclusion. Obviously, a worker is not entitled to prejudgment interest on a workers compensation award until the worker becomes entitled to receive the award. However, there is no statutory language in SDCL 62-4-6 providing that PPD benefits may not commence until rehabilitation benefits terminate. Rather, the operative language of this statute provides that PPD benefits are payable “in addition to” rehabilitation benefits. This “in addition to” language does not suggest that the legislature intended to delay or preclude a simultaneous entitlement to rehabilitation benefits and the benefit an injured worker is entitled to for the permanent partial disability. Therefore, Blenner was entitled to prejudgment interest from the date of her permanent partial disability rating.
[¶ 30.] Our precedent supports this conclusion. In Tischler we expressly affirmed the award of prejudgment interest “from the dates of the impairment ratings even though UPS disputed liability.” Id. at ¶ 65, 552 N.W.2d at 607. Therefore, the trial court correctly concluded that because claimant was entitled to the benefits from the June 26, 1995 impairment rating date, prejudgment interest should also commence from that date.2
[¶ 31.] We do, however, agree that because a lump sum payment was not authorized for the PPD benefits pursuant to SDCL 62-7-6, interest should not have been awarded from June 26, 1995 on the sum of all payments subsequently paid. Instead, interest should have commenced on the date of the PPD rating (June 26, 1995), but it should have been calculated on each weekly payment as it became due.
[¶ 32.] The interest award on PPD benefits is reversed and remanded for recalculation in accordance with this decision.
[¶ 33.] GILBERTSON, Chief Justice, MEIERHENRY, Justice, and LOVRIEN, Circuit Judge, concur.
[¶ 34.] GIENAPP, Circuit Judge, dissenting on Issue Two.. The only expert who testified that the PPD was not a factor in the Cozine analysis was Jerry Gravatt. Gravatt was an expert called to testify by Blenner. The ALJ rejected the testimony of Gravatt.
. The reference to the phrase "further periods” in SDCL 62-4-6 as noted by the dissent, does not change this conclusion. Under the schedule of benefits provided by §§ 62-4-1, 62-4-3 and 63-4-5.1, benefits are awarded in the form of "periods” of weekly compensation. Thus "further periods” is a reference to compensation "amounts" to which a claimant is entitled, rather than the periods of time when benefits commence.