A company produces alternators for cars. They generally use a static budget with the following costs based on 8,000 units per month: Indirect materials, $22,000; Indirect labor, $25,000; Utilities, $12,000; Supervision, $4,000; Depreciation, $18,000. If the company wanted to create a flexible budget for 9,000 units, what value would they record for variable costs?a. $52,875 b. $91,125 c. $70,875 d. $66,375