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4. LampLight Industries gathered the following information for the month of July: Overhead flexible budget: 10,000 13,500 13,000 16,000 17,500 Number of units Standard machine hours 1,500 Budgeted variable overhead costs: $30,000 $53,250 $29,000 $48,000 Budgeted fixed overhead costs: $ 53,500 $63,000 LampLight actually produced 14,000 units in 17,500 machine hours. Total actual overhead cost of $85,500 consisted of $35,000 variable costs and $50,500 are based on a master (static) budget of 15,000 units. Assume the allocation base for fixed overhead costs is the number of units. fixed costs. The standard variable and fixed overhead rates A. Compute the total manufacturing overhead cost variance. B. Compute the overhead flexible budget variance. C. Compute the production volume variance