A manager has the option of purchasing one, two or three machines. Fixed costs and potential ranges of production are as follows: Variable cost is $40 per unit, and revenue is $65 per unit. If projected annual demand is between 600 and 800 units, how many machines should the manager purchase? Justify your answer. A manager has the option of purchasing one, two or three machines. Fixed costs and potential ranges of production are as follows: Variable cost is $40 per unit, and revenue is $65 per unit. If projected annual demand is between 600 and 800 units, how many machines should the manager purchase? Justify your