Bluebird, Inc. had net sales (all on account) in 2020 of $600,000. At December 31, 2020, before adjusting entries, the balances in selected accounts were: accounts receivable $75,000 debit and allowance for doubtful accounts $1,500 debit. Bluebird estimates that 3% of its net sales will prove to be uncollectible. What is the net realizable value of the receivables reported on the financial statements at December 31, 2020?