The following information is available for Pirate Company: Allowance for Doubtful Accounts at December 31, 2020 $ 7,000 Credit Sales during 2021 270,000 Accounts Receivable deemed worthless and written off during 2021 2,800 As a result of a review and aging of Accounts Receivable in early January 2022, however, it has been determined that an Allowance For Doubtful Accounts of $7,500 is required at December 31, 2021. What amount should Pirate record as bad debt expense for calendar 2021?

a) $4,200

b) $3,300

c) $7,500

d) $74,000