You have been hired as a marketing consultant to Johannesburg Burger Supply, Inc., and you wish to come up with a unit price for its hamburgers in order to maximize its weekly revenue. To make life as simple as possible, you assume that the demand equation for Johannesburg hamburgers has the linear formq=mp+b, wherepis the price per hamburger,qis the demand in weekly sales, andmandbare certain constants you must determine.

(a) Your market studies reveal the following sales figures: When the price is set at $2.00 per hamburger, the sales amount to9000per week, but when the price is set at $4.00 per hamburger, the sales drop to zero. Use these data to calculate the demand equation.

q=

(b) Now estimate the unit price that maximizes weekly revenue.

Predict what the weekly revenue will be at that price. ????