4 ABC overhead calculation 423 Beef Max Company sells umbrellas that cover small and large portable barbecues. Based on the advice of its accountant, Beef Max is considering whether to adopt an activity-based costing system. To evaluate the possible impact on cost, the company has accumulated the following data from last year: Overhead cost $400 000 Activity Purchasing Receiving Sales Allocation base Number of purchase orders Number of shipments received Number of sales orders 300 000 200 000 The numbers of activities for small and large portable barbecues were as follows: Small Large Purchase orders 1500 500 Shipments received Sales orders 3500 1500 3000 2000 REQUIRED a Calculate the overhead rates for the following activities: purchasing, receiving and sales. b Calculate the dollar amount of total overhead that should be assigned to small and large portable barbecues for each of the three activities