34 PENSION PLAN Service cost Projected benefit obligation (PBO) Fair value plan assets Actual return on plan assets Deferred gain Discount rate for PBO begin year begin year 60 100 10% Expected return on pension fund Net pension expense for the year A 2 4 D 10 PENSION PLAN AMENDED Increase in pension obligation 100 Employees Total 21 Retiring each year 3 Remaining years of service7 Funding of prior service cost equal contribution over 5 years at 8 % payments at end of year Amortization of prior service cost straight line method 35 Annual prior service cost amortization 4.76 14.29 20.00 Average remain service life Total future year / Number employee D 25.00 AmortizationPrior service cost/ Average remain service life A B Total future years= [N(N+1)/2] x