Grey Corporation uses a job-order costing system with a single plantwide predetermined overhead rate based on machine hours. The company based its predetermined overhead rate for the current year on the following data 20,000 5176,000 $2.20 Total machine hours Total fixed manufacturing overhead cost Variable manufacturing overhead per machine hour Recently. Job F628 was completed with the following characteristics: Total machine hours Total direct labor hours Direct materials cost Direct labor rate 200 720 $540 $10 per hr The total job cost for Job F628 is: O $9,400 O $9.940 O $7.740 O $2,740 O None of the above