Chapter 7.6, Problem 66E

Use a system of inequalities to represent the situations described in Exercises 61 – 68, then solve the system using the methods developed in this section. In drawing the graph of your solution set, you may want to take into consideration that certain quantities cannot be negative and therefore you may want to restrict the solution set appropriately as we did in Example 9.

Advertising. A newly opened Espresso Bar is deciding on advertising to generate business. The owners have $\$2,400$ total to spend for ads in the local newspaper and on the local radio station. A radio ad costs $\$100$, and a newspaper ad costs $\$300$. They want to have at least three times as many radio ads as they have newspaper ads.