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Discount Tax Tips, Percent of changes, and simple interest

**Percents and Percent of Change**

How do you figure out whether a **percent of change** is an increase or a decrease?

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How do you figure out how much something is **marked down**?

How do you figure out **sales tax**?

How do you figure out the price of a **marked up** item?

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What is the formula for **simple interest**?

How do you use the formula for **simple interes**t?