Hamil Company Prepares Monthly Financial Statements and Uses the Gross

Hamil Company prepares monthly financial statements and uses the gross profit method to estimate ending inventories. Historically, the company has had a 40% gross profit margin. During June, net sales amounted to $50,000; the beginning inventory on June 1 was $15,000; and the cost of goods purchased during June amounted to $25,000. The estimated cost of Hamil Company's inventory on June 30 is

A) $10,000.
B) $30,000.
C) $9,000.
D) $20,000.