Innovative tech inc. (iti) has been using the percentage of credit sales method to estimate bad debts. during november, iti sold services on account for $100,000 and estimated that ½ of 1 percent of those sales would be uncollectible. required: prepare the november adjusting entry for bad debts. starting in december, iti switched to using the aging method. at its december 31 year-end, total accounts receivable is $89,000, aged as follows: (1) 1–30 days old, $75,000; (2) 31–90 days old, $10,000; and (3) more than 90 days old, $4,000. the average rate of uncollectibility for each age group is estimated to be (1) 10 percent, (2) 20 percent, and (3) 40 percent, respectively. prepare a schedule to estimate an appropriate year-end balance for the allowance for doubtful accounts.