Ribar Company's predetermined overhead rate is $15.00 per direct labour- hour, and its direct labour wage rate is $10.00 per hour. The following information pertains to Job A-100: Direct materials $315 Direct labour $210 Required: 1. What is the total manufacturing cost assigned to Job A-100? 2. If Job A-100 consists of 40 units, what is the average cost assigned to each unit included in the job? 3. What type of businesses apply job costing? Give some examples