99. At December 1, 2017, Gibson Company's accounts receivable balance was 7.200. During December, Gibson had credit revenues of 30,000 and collected accounts receivable of 24,000. At December 31, 2017, the accounts receivable balance is a. 7,200 debit. b. 13,200 debit. c. 37,200 debit. d. 13,200 credit