posted by Landon .
ohaganbooks is offering a wide range of online books, including current best-sellers. a colleague has determined that the demand for the latest best selling book is given by q=(-p^2)+33p+9 (18<p<28) copies sold per week when the price is p dollars. can you help me determine what price the company should charge to obtain the largest revenue? the cost function is C=9q+100.