The number of students in Ms. Fisher’s class increased from 20 students to 30 students.

What was the percent increase?
A.10%
B.20%
C.35%
D.50%


To find the percent increase, use the formula for percentage change:

\[
\text{Percent Increase} = \frac{\text{New Value} - \text{Original Value}}{\text{Original Value}} \times 100
\]

In this case, the new value is 30 students and the original value is 20 students.

\[
\text{Percent Increase} = \frac{30 - 20}{20} \times 100 = \frac{10}{20} \times 100 = 0.5 \times 100 = 50\%
\]

Therefore, the correct answer is **D. 50%**.

Would you like more details or have any questions?

Here are 5 related questions:
1. How do you calculate a percent decrease?
2. What is the formula for percentage change in general?
3. If the number of students increased from 30 to 45, what would the percent increase be?
4. How does a percent increase differ from an absolute increase?
5. What is the percent change if a value drops from 40 to 32?

**Tip:** Always compare the change relative to the original value when calculating percentage increases or decreases.

The number of students in Ms. Fisher’s class increased from 20 students to 30 students.

What was the percent increase?
A. 10%
B. 20%
C. 35%
D. 50%

Learn how to calculate the percent increase when the number of students grows from 20 to 30. This problem illustrates key concepts of percentage change and ratio, suitable for Grades 5-7 students.

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