Problems 83–89 are based on material learned earlier in the course. The purpose of these problems is to keep the material fresh in your mind so that you are better prepared for the final exam. 

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.