what is the formula to get the answer?

During July, the equivalent units of direct materials added to the product that were worked on by Department A amounted to a total of 90,000 applied as follows: beginning inventory. 14,000 units; units started and completed in July, 66,000 units; and ending inventory, 10,000 units. Assuming that the cost of direct materials requisitioned by the department in July was $270,000; the amount of the materials cost to be assigned to the ending inventory would be: (Do not round intermediate calculations.)