The marketing department of a company estimates that the demand for a product is given by P = 68 - 0.010x dollars, where P is the price per unit and x is the number of units.
The cost of producing x units is given by C = 420 + 50x dollars, and the profit for producing x units is given by
P = R - C = Px - C.
Sketch the graph of the profit function and estimate the number of units that would produce a maximum profit.
x for maximum: