Factory company makes two products, x and z. x is being introduced this period, and z has been in production for 2 years. for the period about to begin, 1,000 units of each product are to be manufactured. assume that the only relevant overhead item is the cost of engineering change orders; that x and z are expected to require eight and two change orders, respectively; that x and z are expected to require 2 and 3 machine hours, respectively; and that the cost of a change order is $600. if factory applies engineering change order costs on the basis of machine hours, the cross-subsidy per unit arising from this peanut-butter costing approach is