Problems 85 – 94. The purpose of these problems is to keep the material fresh in your mind so that you are better prepared for later sections, a final exam, or subsequent courses such as calculus.

In 1978, Congress created a gas guzzler tax on vehicles with a fuel economy of less than 22.5 miles per gallon (mpg). Today, a car getting 20 mpg has a tax of $1700 and a car getting 15 mpg has a tax of $4500. If the tax decreases exponentially as fuel economy increases, determine the tax on a vehicle getting 13 mpg to the nearest $100.