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Elfect of doubtful accounts on net income During its firet year of operations, Mack's Plumbing 5 upply Co, had sales of $430,000, wrote off $6,000 of accounts as uncollectble using the direct watite-off mathod, and reported net income of 347,300 . Astume thet during the second year of operations Mack's Plumbing Supply Co. had sales of $516,000, wrote off $7,200 of acceunts as uncollective using the direct writeroff method, and reported net income of 551,600 . a. Determine what net income would have been in the second yeat if the allonance method (using 1.75 to of inles) had been used in both the first and setond yeara. b. Determine what the balance of the atiowance for doubtful accounts would have been at the end of the second year if the allowance method had been used in both the first and second years. If required, use the minus sign to indicate a "debit" balance