1. Problem Barkley runs a canoe-rental business on a small river in Pennsylvania. Currently, the business charges $12 per canoe and they average 36 rentals a day. A study shows that for every $.50 increase in rental price, the business can expect to lose two rentals per day. Find the price that will maximize income. 2. The attempt at a solution I found this problem on the internet. I can probably solve the problem manually, but I want to learn how to create a set of equation to describe this situation. R= revenue, x= rental rate and t= number of rentals R = x * t R= 432 in a normal state. I am not sure how to link a $0.50 change in x to a 2 unit change in t. How should I go about this? Thanks.