Question

Find the percent of decrease from 136 days to 85 days. Round the percent to the nearest tenth if necessary.

Answer 1

To find the percent of decrease, you can use the formula:

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

In this case, the old value is 136 days and the new value is 85 days.

1. Calculate the decrease:
\[
\text{Decrease} = 136 - 85 = 51
\]

2. Substitute the values into the formula:
\[
\text{Percent Decrease} = \left( \frac{51}{136} \right) \times 100
\]

3. Calculate the fraction:
\[
\frac{51}{136} \approx 0.375
\]

4. Now multiply by 100 to convert to percent:
\[
0.375 \times 100 = 37.5
\]

Thus, the percent of decrease from 136 days to 85 days is approximately **37.5%**.