During the current year, Robby's Camera Shop had sales revenue of $170,000, of which $75,000 was on credit. At the start of the current year, Accounts Receivable showed a $16,000 debit balance, and the Allowance for Doubtful Accounts showed a $900 credit balance. Collections of accounts receivable during the current year amounted to $60,000. Data during the current year follows:

a. On December 31, an Account Receivable (J. Doe) of $1,700 from a prior year was determined to be uncollectible; therefore, it was written off immediately as a bad debt.

b. On December 31, on the basis of experience, a decision was made to continue the accounting policy of basing estimated bad debt losses on 1.5 percent of credit sales for the year.

Prepare the required journal entries for the two items on December 31, the end of the accounting period.