d= annual demand for a product in units p= price per unit *Assume that a firm accepts the follwing price demand relationship as being realistic :

d= annual demand for a product in unitsp= price per unit*Assume that a firm accepts the follwing price demand relationship as being realistic :d = 800 - 10p * Where p must between $ 20 and $ 70***How many units can the firm sell at the $20 per unit price and at the $70 per unit price ??