Requirement a. Derive net income for 2009 to 2012 using the first set of accounting policies. For the year-end balance for 2012, assume accounts receivable, allowance for doubtful accounts, and the warranty accrual are $0, as the firm wound itself up during the year and all timing differences have been resolved. (Enter a 0 for any zero balances.) Accounting policy set 1 a. Use straight-line depreciation method on the firm?s only asset. The computer cost$1,100,000 and has an estimated useful life of four years. b. Estimate warranty expense as 9% of sales. C. Estimate bad debts expense as 5% of sales. Accounting policy set 2 Use 50% declining-balance method for depreciation. Estimate warranty expense as I 0% of sales. The year-end allowance for doubtful accounts should be 40% of gross accounts receivable