Answer:
Cost per unit of overhead = $330,891.46/550 = $601.62
Explanation:
Total units produced of A4 = 550
Activity Total cost Activity rate of A4 Total Activity
Labor Related $160,558 3,575 DLH 6,550 DLH
Machine Setup $8,050 550 Setups 1,000 Setups
Order Size $497,027 3,700 MHs 7,700 MHs
Total $665,635
Overhead applied to Product A4
Labor = 
Machine Setup = 
Order Size = 
Total Cost for 550 units = $87,632.80 + $4,427.5 + $238,831.16 = $330,891.46
Cost per unit of overhead = $330,891.46/550 = $601.62