-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 Issued $ 300.00 1,080.00 720.00 to Direct Labor $ 600.00 940.00 1,400.00 5,120.00 Job 18AX.... 19BT.... 20CD..... 21FB..... 4,200.00 Assume that factory overhead is applied on the basis of direct labor costs and that the predetermined rate is 200%.