please show the calculation

Oman Marble Company has two processing departments, Cutting and Polishing. The company uses a multiple predetermined overhead rate in each processing department under job-order costing system. The Cutting Department's predetermined overhead rate is based on machine-hours and the Polishing Department's predetermined overhead rate is based on direct labor cost. At the beginning of the current period, the company records show the following estimated information 0. Polishing Cutting 70 20 $ Direct Labor cost per hour 10,000 5,000 Direct labor-hours 5,000 20,000 Machine-hours 60.000 $ 100.000 Total fixed manufacturing overhead cost 2 $1 Variable manufacturing overhead per machine-hour 8 $11 Variable manufacturing overhead per direct labor-houn During the current period the company started and finished a job order number 3122. The job cost sheet shows the following data for this job Polishing Cutting Job3122 20 90 Machine-hours 60 301 Direct labor-hours 250 $800 $ Direct materials 5.000 $450 Direct labor cost The total job cose for Jobs122 is closest to 6,500 $ .a o .None of the given answer bo 7.850 $ .co 8.130 $ d 0 1