Griffin Shoe Company records Sales Returns and Allowances, Sales Discounts, and Credit Card Discounts as contra-revenues. July 12 Sold merchandise to customer at factory store who charged the $300 purchase on her American Express card. American Express charges a 1 percent credit card fee. Cost of goods sold was $175. July 15 Sold merchandise to Customer T at an invoice price of $5,000; terms 3/10, n/30. Cost of goods sold was $2,500. July 20 Collected cash due from Customer T. July 21 Before paying for the order, a customer returned shoes with an invoice price of $900; cost of goods sold was $600. Complete the following table by entering the amounts of the effects of each transaction, including the related cost of goods sold. (Indicate decreases with a minus sign.) Transaction Net Sales Cost of Goods Sold Gross Profit July 12 July 15 July 20 July 21