a company has two products: a1 and b2. it uses activity-based costing and has prepared the following analysis showing budgeted cost and activity for each of its three activities: activity budgeted cost activity cost driver budgeted activity product a1 product b2 activity 1 $ 58,000 square feet 2,200 5,800 activity 2 $ 73,000 units repaired 3,240 5,760 activity 3 $ 100,000 orders 8,200 1,800 annual production and sales level of product a1 is 9,480 units, and the annual production and sales level of product b2 is 23,310 units. what is the approximate overhead cost per unit of product a1 under activity-based costing?