Explain how you know whether a percent of change is a percent increase or a percent decrease

A mark up or sales tax is a percent increase.

A discount or mark down is a percent decrease.

You need to figure out whether you have more or less at the end than you had

when you started out. I guess maybe that can sometimes be tough.

Rules:

- - If you have more at the end than you started with, then the change

is an increase.

- - If you have less at the end than you started with, then the change

is a decrease.