Aztecs Corporation uses a periodic inventory system and the retail inventory method to estimate ending inventory and cost of goods sold. The following data are available for the month of September: Cost Retail Beginning inventory $ 19,800 $ 34,200 Net purchases 9,900 ?question mark Net markups 4,700 Net markdowns 1,700 Net sales ?question mark The company used the average cost flow method and estimated inventory at the end of September to be $16,060.00. If the company had used the LIFO cost flow method, the cost-to-retail percentage would have been 50%. Required: Compute net purchases at retail and net sales for the month of September using the information provided