Answer:
Craft Pro Machining
The overhead cost for each unit of the jobs:
 Job 3175 Job 4286
Number of units 200 units 2,500 units 
Direct labor hours 500 DLH 4,375 DLH
Plantwide overhead rate = $371.28205
Overhead allocation $185,641.03 $1,624,358.97
Unit overhead cost $928.21 $649.74
Step-by-step explanation:
a) Data and Calculations:
Production Activity Indirect Labor Indirect Materials Other Overhead Grinding $ 320,000 
Polishing $ 135,000 
Product modification 600,000 
Providing power $ 255,000 
System calibration 500,000 
Total overhead cost $1,810,000
Additional information on the drivers for its production activities follows. 
Grinding 13,000 machine hours 
Polishing 13,000 machine hours 
Product modification 1,500 engineering hours 
Providing power 17,000 direct labor hours 
System calibration 400 batches 
 Job 3175 Job 4286 
Number of units 200 units 2,500 units 
Machine hours 550 MH 5,500 MH 
Engineering hours 26 eng. hours 32 eng. hours 
Batches 30 batches 90 batches 
Direct labor hours 500 DLH 4,375 DLH 4,875 DLH
Plantwide overhead rate based on direct labor hours:
= Total overhead costs/Total direct labor hours
= $1,810,000/4,875
= $371.28205