Help me find the net sales for this accounting problem?

The following transactions were selected from among those completed by Cadence Retailers in 2013: Nov 20 . 25 Sold 20 items of merchandise to Customer B at an invoice price of $5,500 (total); terms 3/10, n/30. Sold two items of merchandise to Customer C, who charged the $400 sales price on her Visa credit card. Cadence Retailers a 2 percent credit card fee. 28 29 Sold 10 identical items of merchandise to Customer D at an invoice price of $9,000 (total); terms 3/10, n/ Customer D returned one of the items purchased on the 28th; the item was defective, and credit was give customer. Dec . 6 20 Customer D paid the account balance in full. Customer B paid in full for the invoice of November 20, 2013. Given Assume that Sales Returns and Allowances, Sales Discounts, and Credit Card Discounts are treated as contra-revenu net sales for the two months ended December 31, 2013. (Do not round your intermediate calculations.) What do Net Sales=