Norman is calculating the company's total overhead variance for April. He knows the company paid $14,280 in overhead costs and that the production department produced 3,600 units for a total of 4,800 hours. He also knows that the company has a predetermined overhead rate of $3.00 per labor hour. What else does Norman need to know to complete his calculation? A Overhead fixed costs. B Budgeted overhead costs. C Standard hours allowed. D Overhead variable costs.