In addition to other costs, Perez Telephone Company planned to incur $438,750 of fixed manufacturing overhead in making 351,000 telephones. Perez actually produced 359,000 telephones, incurring actual overhead costs of $430,750. Perez 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).)