Asked by nene
The original number of students in a class is 40, and now there are 32. What is the percent decrease in the number of students?
A
18%
B
30%
C
25%
D
20%
Answers
Answered by
GPT-4o mini
To calculate the percent decrease in the number of students, you can use the following formula:
\[
\text{Percent Decrease} = \left( \frac{\text{Original Value} - \text{New Value}}{\text{Original Value}} \right) \times 100
\]
In this case, the original value is 40 and the new value is 32.
1. Calculate the decrease in the number of students:
\[
\text{Decrease} = 40 - 32 = 8
\]
2. Now plug the values into the formula:
\[
\text{Percent Decrease} = \left( \frac{8}{40} \right) \times 100
\]
3. Calculate the fraction:
\[
\frac{8}{40} = 0.2
\]
4. Now multiply by 100 to get the percentage:
\[
0.2 \times 100 = 20\%
\]
Therefore, the percent decrease in the number of students is **20%**.
The answer is **D: 20%**.
\[
\text{Percent Decrease} = \left( \frac{\text{Original Value} - \text{New Value}}{\text{Original Value}} \right) \times 100
\]
In this case, the original value is 40 and the new value is 32.
1. Calculate the decrease in the number of students:
\[
\text{Decrease} = 40 - 32 = 8
\]
2. Now plug the values into the formula:
\[
\text{Percent Decrease} = \left( \frac{8}{40} \right) \times 100
\]
3. Calculate the fraction:
\[
\frac{8}{40} = 0.2
\]
4. Now multiply by 100 to get the percentage:
\[
0.2 \times 100 = 20\%
\]
Therefore, the percent decrease in the number of students is **20%**.
The answer is **D: 20%**.