Calculator The standard factory overhead rate is $12 per machine hour ($10 for variable factory overhead and $2 for fixed factory overhead) based on 100% capacity of 42,000 machine hours. The standard cost and the actual cost of factory overhead for the production of 2.000 units vrere a follows: Actual: Variable factory overhead $350,500 Fixed factory overhead 84,000 Standard: 35,000 hours @ $12 420,000 Determine the (a) volume variance, (b) controllable variance, and (c) total factory overhead cost variance. 232,000 X a. Volume variance s 116,000,x b. Controllable variance c. Total factory overhead cost variance