Chapter 13.2B, Problem 27A

A store has wrapping paper on sale, One packed is 3 rolls of $2\frac{1}{2}\text{ ft}\times \text{8 ft}$ for $\text{\$6}\text{.00}$.Another package is 5 rolls of $2\frac{1}{2}\text{ ft}\times \text{6 ft}$ for $\text{\$8}\text{.00}$. Which is the better buy per square foot.