The formula for percent decrease is:

\[
\text{Percent Decrease} = \frac{\text{Old Value} - \text{New Value}}{\text{Old Value}} \times 100
\]

### Steps:
1. Subtract the new value from the old value.
2. Divide the result by the old value.
3. Multiply by 100 to convert it to a percentage.

### Example:
If the price of a product decreases from $50 to $40:
\[
\text{Percent Decrease} = \frac{50 - 40}{50} \times 100 = \frac{10}{50} \times 100 = 20\%
\]

Would you like more details or have any questions?

Here are five related questions:
1. How would you calculate percent increase?
2. What is the formula for calculating percentage change in general?
3. How can percent decrease be used in real-life situations?
4. How does percent decrease differ from percent error?
5. Can you explain how to reverse a percent decrease to find the original value?

**Tip:** Always ensure that your old value is greater than the new value when using the percent decrease formula.

Learn how to calculate percent decrease with a simple formula. This guide explains how to subtract the new value from the old value, divide by the old value, and multiply by 100 to convert to a percentage. Example included for easy understanding, suitable for Grades 6-8.

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