Please help. I can't get the math to comeOut right

Direct labor hours were estimated as follows: Fabrication Department 3,500 hours Assembly Department 3,500 Total 7,000 hours In addition, the direct labor hours (dlh) used to produce a unit of ea follows: Production Departments Gasoline Engine Diesel Engine Fabrication Department 1.20 dlh 2.80 dih Assembly Department 2.80 1.20 Direct labor hours per unit 4.00 dlh 4.00 dlh a. Determine the per-unit factory overhead allocated to the gasoline direct labor hours as the activity base. Gasoline engine $ 56 X per unit Diesel engine I