Credit Losses Based on Accounts Receivable Aging Graham Inc. analyzed its accounts receivable balances at December 31, and arrived at the aged balances listed below, along with the percentage that is estimated to be uncollectible: The company handles credit losses using the allowance method. The credit balance of the Allowance for Doubtful Accounts is $4,680 on December 31 , before any adjustments. a. Determine the amount of the adjustment for estimated credit losses on December 31. b. Determine the financial statement effect of a write off of the Matthews Company's account on April 10 of the following year in the amount of $1,275. Use negative signs with answers, when appropriate. If a transaction increases and decreases the same Balance Sheet category, enter the increase amount in the first row and the decrease amount directly below (in the second row)