The pension plan's normal cost shall be comprised of the following:
A. The unfunded liability of the pension plan. "Unfunded liability" means the present value of the unfunded pension benefits accrued under the pension plan during all years prior to the current year. The unfunded liability of the pension plan shall be amortized over 25 years.
B. The future service liability of the pension plan. "Future service liability" means the present value of pension benefits accrued during the current year.
C. Allowable administrative costs for the management and administration of the pension plan and the pension fund.