Calculate the missing numbers in the following situations. (Input all amounts as positive values.) Invoice cost of merchandise purchases Purchase discounts Purchase returns and allowances Cost of transportation-in Merchandise inventory (beginning of period) Net cost of merchandise purchases Merchandise inventory (end of period) Cost of goods sold $ a 43,000 $ 1,000 1,000 3,500 43,700 1,700 $ b 20,000 $ 650 1,250 19,250 3,250 19,800 $ C 15,250 275 450 1,000 2,500 16,065

Calculate the missing numbers in the following situations. (Input all amounts as positive values.)