Kilbourne Appliances produces two models of beverage coolers for homes and offices, the KA-15 and the KA-24. Data on operations and costs for March follow. Units produced Machine-hours Direct labor-hours Direct materials costs Direct labor costs Manufacturing overhead costs Total costs Required: KA-15 630 KA-24 420 Total 360 750 $ 73,000 15,000 540 1,750 $ 122,500 35,000 1,050 900 2,500 $ 195,500 50,000 191,700 $ 437,200 a. Compute the predetermined overhead rate assuming that Kilbourne Appliances uses direct labor-hours to allocate overhead costs. Note: Round your answer to 2 decimal places. b. Compute the predetermined overhead rate assuming that Kilbourne Appliances uses machine-hours to allocate overhead costs. a. Predetermined overhead rate b. Predetermined overhead rate per direct labor-hour per machine-hour