The function gives the cost to manufacture x items. C(x) = 15,000 + 50x + - 800 . ; x = 100 X Find the average cost per unit of manufacturing h more items (i.e., the average rate of change of the total cost) at a production level of x, where x is as indicated and h = 10 and 1. (Use smaller values of h to check your estimates.) HINT [See Example 1.] (Round your answers to two decimal places. h 10 1 Cave Estimate the instantaneous rate of change of the total cost at the given production level x, specifying the units of measurement. C'(100) = ---Select--- v