please explain how you got the answer (the answer above is wrong)

The following transactions were selected from among those completed by Cadence Retailers November and December: Nov. 20 Sold 20 items of merchandise to Customer B at an invoice price of $6,400 (total), terms 4/10, n/30 Retailers a 1 percent credit card fee 25 Sold two items of merchandise to Customer C, who charged the $600 sales price on her Visa credit card. Visa charges Cadence 28 Sold 10 identical items of merchandise to Customer D at an invoice price of $9,000 (total); terms 4/10, n/30 29 Customer D returned one of the items purchased on the 28th; the item was defective, and credit was given to the customer. Dec. 6 Customer D paid the account balance in full 20 Customer B paid in full for the invoice of November 20. Required Assume that Sales Returns and Allowances, Sales Discounts, and Credit Card Discounts are treated as contra-revenues; compute net sales for the two months ended December 31. (Do not round your intermediate calculations. Round your answer to the nearest whole dollar amount.) Net sales14,740