The 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

$ 650,750

Shop direct labor

520,625

Shop and repair equipment depreciation

12,800

Shop supervisor salaries

93,125

Shop property tax

22,300

Shop supplies

12,650

Advertising expense

18,100

Administrative office salaries

61,600

Administrative office depreciation expense

8,050

Total costs and expenses

$1,400,000

The average shop direct labor rate is $17 per hour.

Determine the predetermined shop overhead rate per direct labor hour.