) This month your vendor invoiced $31,500 in testing charges for your production run. The unit cost for testing is twice as much for each of the first 400 units

per month as compared to each unit over 400. If we shipped 500 units to the vendor this month, find: (a) Average cost per unit; (b) Cost per unit below the price break point; (c) Marginal cost for the 650th unit.