Redfern Audio produces audio equipment including headphones. At the Campus Facility, it produces two wireless models, Standard and Enhanced, which differ both in the materials and components used and in the labor skill required. Data for the Campus Plant for the third quarter follow. Units produced Standard 24,000 Machine-hours 14,400 Direct labor-hours: 18,000 Direct materials costs $480,000 Direct labor costs 288,000 Enhanced 8,000 9,600 18,000 $720,000 612,000 Total 32,000 24,000 36,000 $ 1,200,000 900,000 Manufacturing overhead. 864,000 $2,964,000 Total costs Required: Compute the predetermined overhead rate assuming that Redfern Audio uses direct labor-hours to allocate overhead costs. Answer is complete but not entirely correct. Predetermined overhead rate 99 per direct labor hour