In addition to other costs, Gibson Telephone Company planned to incur $449,330 of fixed manufacturing overhead in making 343,000 telephones. Gibson actually produced 349,000 telephones, incurring actual overhead costs of $440,330. Gibson establishes its predetermined overhead rate based on the planned volume of production (expected number of telephones) Required: a. Calculate the predetermined overhead rate. (Round your answer to 2 decimal places.) b. Determine the fixed cost spending variance and indicate whether it is favorable (F) or unfavorable (U). (Select "None" if there is no effect (i.e., zero variance).) c. Determine the fixed cost volume variance and indicate whether it is favorable (F) or unfavorable (U). (Select "None" if there is no effect (i.e., zero variance).) per unit a b Predetermined overhead rate Total fixed cost spending varianco Total fixed cost volume variance