E following transactions were selected from among those completed by bennett retailers in november and december: november 20 sold 20 items of merchandise to customer b at an invoice price of $6,300 (total); terms 3/10, n/30. november 25 sold two items of merchandise to customer c, who charged the $800 (total) sales price on her visa credit card. visa charges bennett retailers a 2 percent credit card fee. november 28 sold 10 identical items of merchandise to customer d at an invoice price of $9,200 (total); terms 3/10, n/30. november 29 customer d returned one of the items purchased on the 28th; the item was defective and credit was given to the customer. december 6 customer d paid the account balance in full. december 20 customer b paid in full for the invoice of november 20.