If the estimated rate of gross profit is 30%, what is the estimated cost of the merchandise inventory on September 30, based on the following data? Sep. 1 Sep. 1-30 Sep. 1-30 Merchandise inventory (at cost) Purchases, net (at cost) Sales $125,000 300,000 150,000 Oa. $275,000 b. $320,000 c.$192,500 Od. $105,000