Wade company prepares monthly financial statements and uses the gross profit method to estimate ending inventories. Historically, the company has had a 40% gross profit rate. During June, net sales amounted to $60000, the beginning inventory on june 1 was $18000 and the cost of goods purchased during june amounted to $27000. the estimate cost of Wade company's inventory on June 30 is a) $ 15000 b) $ 24000 c) $ 36000 d) $ 9000