The marketing department at Texas Instruments has found that when certain calculators are sold at a price of p dollars the revenue (in dollars) as a function of the price is:

R(p)=-150p^2 + 21000p

a) What unit price should be established in order to maximize revenue?

b) If this price is charged what is the maximum revenue.

c) Graph the function R(p)

Any help with getting off to a start would be greatly appreciated!

Thanks!