4 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. 2 points Units produced Machine-hours 00:56:07 Direct labor-hours Standard 27,900 16,740 20,925 Enhanced Total 9,300 11,160 20,925 37,200 27,900 41,850 Direct materials costs Direct labor costs $ 558,000 334,800 $ 837,000 711,450 Manufacturing overhead Total costs $ 1,395,000 1,046,250 786,780 $ 3,228,030 eBook Required: Print Compute the predetermined overhead rate assuming that Redfern Audio uses direct material costs to allocate overhead costs. Note: Round your answer to 2 decimal places. Predetermined overhead rate References % of materials cost