In the first hour after opening, a bakery sold 80 muffins. However, in the second hour, they only sold 64 muffins.

What is the percent decrease in muffin sales?
A.40% decrease
B.15% decrease
C.20% decrease
D.16% decrease

To calculate the percentage decrease in muffin sales from the first hour to the second hour, we use the formula:

\[
\text{Percentage decrease} = \frac{\text{Decrease in sales}}{\text{Original sales}} \times 100
\]

1. **Decrease in sales** = 80 (first hour sales) - 64 (second hour sales) = 16 muffins.
2. **Original sales** = 80 muffins (the sales during the first hour).

Now, we apply the formula:

\[
\text{Percentage decrease} = \frac{16}{80} \times 100 = 20\%
\]

Therefore, the percentage decrease in muffin sales is **20%**, making the correct answer:

**C. 20% decrease**

Would you like any further details or explanations on this?

Here are 5 related questions for practice:
1. If the bakery sold 90 muffins in the first hour and 72 in the second hour, what would be the percentage decrease?
2. How would you calculate the percentage increase if the muffin sales went up from 64 to 80?
3. What is the formula for calculating percentage increase or decrease in any context?
4. If the bakery sold 50 muffins in the first hour and 75 in the second hour, what is the percentage increase?
5. Can you calculate the percentage decrease if sales drop from 100 muffins to 85 muffins?

**Tip:** When calculating percentage changes, always use the initial value as the reference for your calculation.

In the first hour after opening, a bakery sold 80 muffins. However, in the second hour, they only sold 64 muffins. What is the percent decrease in muffin sales?
A. 40% decrease
B. 15% decrease
C. 20% decrease
D. 16% decrease

Learn how to calculate the percentage decrease in muffin sales when a bakery's sales drop from 80 muffins in the first hour to 64 muffins in the second hour. This problem demonstrates basic percentage calculations, suitable for students in Grades 5-7.

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