A firm has demand equation Q = 20 - 3P. The firm must sell an integer quantity of product and charge the same price per unit of product for all units sold. It costs the firm $4 to produce and sell each unit of product that it sells. The firm acts to maximize its total profits. Calculate these: (You MUST show your calculations to receive any credit for your answers: Price per unit__________ quantity of units___________ total profits___________