Demand The demand function for a product is given by P = 8,000(1 - 4 + e-0.002x where p is the price per unit (in dollars) and x is the number of units sold. Find the number of units sold when p = $500 and p = $800. Use a graphing utility to verify your results in parts (a) and (b). (Round your answers to the nearest whole number.) (a) p = $500 x = 916 x units (b) p = $800