For the last several years Conway Corporation has operated with a gross profit rate of 40%. On January 1 of the current year, the company had on hand inventory with a cost of $600,000. Purchases of merchandise during January amounted to $150,000, and sales for the month were $360,000. Using the gross profit method, what is the estimated inventory at January 31?

144,000

216,000

360,000

534,000