A local retailer has decided to carry a well-known brand of shampoo. The marketing department tells them that the
quarterly demand by an average man is:
Qd = 5.5 - 0.75P
and the quarterly demand by an average woman is:
Qd = 4 -0.5P
The market consists of 10,000 men and 10,000 women. How many bottles of shampoo can they expect to sell if they charge $6 per bottle?