Rochester Heating Systems, Inc. calculates its predetermined overhead rate on a quarterly basis. The following estimates were made for the current year Quarterly Predetermined Overhead Estimated Estimated Rate (per Manufacturing Direct-Labor direct-labor Hours 25,000 16,000 Overhead hour) First quarter 75,000 Second 96,000 quarter Third quarter 37,500 Fourth 12,500 84,000 14,000 quarter Total $292,500 67,500 The firm's main product, part number SC71, requires $200 of direct material and 20 hours of direct labor per unit. The labor rate is $15 per hour 1. Calculate the firm's quarterly predetermined overhead rate for each quarter. Predetermined Overhead Rate First quarter Second quarter Third quarter Fourth quarter per hour per hour per hour per hour