please solve

As of December 31, 2020 General Science Co. had an AR balance of $600,000 and a balance in the allowance for bad debt of $15,000 (credit balance after all write-offs had been processed) prior to closing the books for year-end 2020 (December 31). Over the course of 2020, the Company had sales (all on credit) of $2,800,000. The Company uses the Income Statement Method for determining the allowance (and the related bad debt expense) and the amount is calculated using 1% of credit sales. Assuming the Company records the appropriate journal entry for bad debt expense/allowance as part of the 2020 year-end close, what is the net book value of the A/R at December 31, 2020? $557,000 None of the possible answers are correct $572.000 $600,000 $585.000