National Inc. manufactures two models of CMD that can be used as cell phones, MPX, and digital camcorders. Model Annual Sales in Units High F 10,000 Great P 16,000 National uses a volume-based costing system to apply factory overhead based on direct labor dollars. The unit prime costs of each product were as follows: High F Great P $38.00 $25.40 Direct materials Direct labor $17.52 $13.14 Budget factory overhead: Engineering and Design 2,409 engineering hours $404.712 Quality Control 12,848 inspection hours 269,808 Machinery 33,726 machine hours 539,616 26,400 direct labor Miscellaneous Overhead 134,904 hours Total $1.349,040 National's controller had been researching activity-based costing and decided to switch to it. A special study determined National's two products have the following budgeted activities: High F Great P Engineering and design hours 969 1,440 Quality control inspection 5,648 7.200 hours Machine hours 20.286 13,440 Labor hours 12,000 14,400 What is the overhead application rate using the firm's volume-based costing system (rounded to the nearest percent or cents)? 68 per cent of direct labor cost. $51.89 per direct labor-hour. 350 percent of direct labor cost. 5,189 percent of direct labor cost. 5,110 percent of direct labor cost