Qinshan Co. uses the percentage of sales approach to record bad debt expense. It estimates that 1.5% of net credit sales will become uncollectible. Credit sales are $950,000 for the year ended April 30, 2021, sales returns and allowance are $60,000; sales discounts are $20,000; accounts receivable are $310,000; and the allowance for doubtful accounts has a credit balance of $6,000.

a. Prepare the adjusting entry to record bad debt expense in 2021.

b. Calculate the carrying amount of accounts receivable on April 30, 2021.