P4-9 Determining total job costs, using predetermined overhead rate Channel Products Inc. uses the job order cost system of account- ing. The following is a list of the jobs completed during March, showing the charges for materials issued to production and for direct labor. Materials Direct Job Issued Labor 18AX.. $ 300.00 $ 600.00 19BT. 1,080.00 940.00 20CD.. 720.00 1,400.00 21FB 4,200.00 5,120.00 Assume that factory overhead is applied on the basis of direct labor costs and that the predetermined rate is 200%. Required: 1. Compute the amount of overhead to be added to the cost of each job completed during the month. 2. Compute the total cost of each job completed during the month. 3. Compute the total cost of producing all the jobs finished during the month