### Home > CCG > Chapter 7 > Lesson 7.2.5 > Problem 7-99

7-99.

The principal’s new car cost

Use the exponential function:

,

*,*

Solve for .

After you find “" convert it to a percent and subtract from

Percent decrease is

7-99.

The principal’s new car cost

Use the exponential function:

,

Solve for .

After you find “" convert it to a percent and subtract from

Percent decrease is