The following incomplete (columns have missing amounts) pension spreadsheet is for Old Tucson Corporation (OTC). ($ in millions) Debit(Credit) Beginning balance Service cost Net Prior Plan Service (Gain) Pension Loss PBO Assets Cost (470) Net Pension Expense Cash (Liability)/Asset 52 53 Interest cost Expected return on assets Gain/loss on assets Amortization of: Prior service cost Net gain/loss Loss on PBO Contributions to fund Retiree benefits paid Ending balance (20) (1.75) (4) 22 (47) (270) (22) 37 (37) (541) 271 48 69 What was the balance of the net pension asset/liability reported in the balance sheet at the end of the previous year?