Elect of doubtful accounts on net income Duning its first year of operations, Mack's Plumbing Supply Ca. had sales of $390,000, wrote off $6,000 of accounts as uncollectable using the direct wnite off inethod, and reported ner ncome of $42,900. Assume that dunng the second year of aperabions Mack's Plumbing Supply Co. had sales of $468,000, wrote olf $7,200 of nccounts as uncollectithe using the diroct write off method, and reported net incorve of $46,800. a. Determine what net income would have been in the second year if the ablowance method (using 1.75% of sales) had been used in both the fins and uscand years. b. Determine what the balance of the allowance for doutsul accoints would have been at the end of the second year if the allowance method had been useif in both the firat and second vears. If required, use the minus sign to indicate a "debin" balance