What are the coordinates of the point on the directed line segment from (-3,2) to (7,7) that partitions the segment into a ratio of 3 to 2?

I'm at a bookstore with $\$35$ in my pocket and a $20\%$-off coupon. what is the cost of the most expensive book i can buy with my money and the coupon? (assume that there are books of every possible price in the bookstore. it's a large bookstore! )