Aztec Corporaton uses a periodic inventory system and the retall inventory method to estimate ending inventory and cost of goods sold. The following data are avaliable for the month of September: The company used the average cost flow mothod and ostmated inventory at the end of September to be $17,437.50 if the company had used the LIFO cort flow method, the cost to-retal percentage would have been 50%. Required: Compute net purchases at rotal and net sales for the month of September using the information provided. Note Do not round your intermediate calculations