Mac1123

es Suppose that the dollar cost of producing x appliances is c(x) = 1300 + 70x - 0.3x?. a. Find the average cost per appliance of producing the first 90 appliances. b. Find the marginal cost when 90 appliances are produced. c. Show that the marginal cost when 90 appliances are produced is approximately the cost of producing one more appliance after the first 90 have been made, by calculating the latter cost directly