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At December 1, 2017, Swifty Corporation Accounts Receivable balance was $12770. During December, Swifty had credit sales of $34200 and collected accounts receivable of $27360. At December 31, 2017, the Accounts Receivable balance is _____________.
a) $19610 credit
b) $1 debit
c) $46970 debit
d) $19610 debit