Gore 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 $60,000; the beginning inventory on June 1 was $18,000; and the cost of goods purchased during June amounted to $27,000. The estimated cost of Gore Company's inventory on June 30 is $9,000 $36,000. $15,000. $24,000