Exotic Engine Shop uses a job order cost system to determine the cost of performing engine repair work. Estimated costs and expenses for the coming period are as follows: Engine parts $760,400
Shop direct labor 555,000
Shop and repair equipment depreciation 57,000
Shop supervisor salaries 158,500
Shop property taxes 28,800
Shop supplies 22,100
Advertising expense 15,200
Administrative office salaries 65,400
Administrative office depreciation expense 8,400
Total costs and expenses $1,670,800

The average shop direct labor rate is $15.00 per hour.

Required:
Determine the predetermined shop overhead rate per direct labor hour.