I am just confused about this last part, the "activity based costing"

Calculate the cost of Job 358 using activity-based costing. Job Cost Record JOB 358 Manufacturing Costs Direct labor Direct materials Engineering costs Maintenance costs Manufacturing overhead allocated Waste disposal costs remaining C ar in the input fields and then click Check Answer. Clear All Total estimated manufacturing costs 1 Estimated total machine hours Plantwide mfg. overhead rate $ 140 1,260,000 9,000 Calculate the cost of Job 358. Job Cost Record Manufacturing JOB 358 Costs 14,850 Direct materials Direct labor Manufacturing overhead allocated 800 16,800 32,450 Total job cost Requirement 2. Calculate the cost of Job 358 using activity-based costing. Begin by calculating the allocation rate for each activity. First determine the formula to compute the allocation rate in an activity-based costing system, then compute the rate for e hours, Mach.=Machine, Eng.=Engineering) Activity cost Total est activity cost pool 90,000 / . Total est activity allocation base / 9,000 allocation rate 10 per MH Mach, maintenance $ $ Eng. change orders $ 50,000 / 1,000 $ 50 per order Waste disposal $ 1,120,000 / 4,000 = $ 280 per pound Description of Cost Pool Machine maintenance costs. Engineering change orders Hazardous waste disposal GA Estimated Activity for this Year 9,000 1,000 Estimated Cost Cost Driver $ 90,000 Number of machine hours. 50,000 Number of change orders $ 1,120,000 Pounds of hazardous materials generated .. $ 1,260,000 $ $ 4,000 Total overhead cost.. Print Done 270 pounds of direct materials at $55 per pound 40 direct labor hours used at $20 per labor hour 120 machine hours used 10 change orders 60 pounds of hazardous waste generated Calculate the cost of Job 358 using activity-based costing. Job Cost Record Manufacturing JOB 358 Costs Total job cost