The following incomplete (columns have missing amounts) pension spreadsheet is for Old Tucson Corporation (OTC). Plan assets Prior service cost Net (Gain) loss 50 PBO (460) Net Pension (Liability)/ Asset Pension Expenses Cash 50 (19) (1.50) ($ in millions) debit (credit) Beginning Balance Service cost Interest cost Expected return on assets Gain/loss on assets Amortization of Prior service cost Net gain loss Loss on PBO Contribution to funds Retiree benefits paid Ending balance (3) (21) 21 (44) 35 (529) (35) 266 46 66 (264) What was the balance of the net pension asset/liability reported in the balance sheet at the end of the previous year