A marketing consultant uses the job costing system and has a pre-determined overhead rate of $15 per direct labor hour. This amount is based on an estimated overhead of $30,000 and an average time of 5.0 hours per job. Job #521 incurred direct material costs of $50 and 6 direct labor hours costing of $75 per hour. The total cost of job #521 is:

A. $155.

B. $215.

C. $565.

D. $590.

I know the ansnwer is D. But how is that number gotten?