Problem 1-11 For most products, higher prices result in a decreased demand, whereas lower prices result in an increased demand. Let d = annual demand for a product in units p = price per unit Assume that a firm accepts the following price-demand relationship as being realistic: d = 800 - 10p where p must be between $20 and $70. How many units can the firm sell at the $20 per-unit price? Round your answer to the nearest whole number.