To calculate the percent change in Jess's hourly wages, we can use the following formula:
\[ \text{Percent Change} = \frac{\text{New Value} - \text{Old Value}}{\text{Old Value}} \times 100 \]
In this case, the new value (after the raise) is $9.85, and the old value (before the raise) is $8.50.
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Calculate the difference: \[ 9.85 - 8.50 = 1.35 \]
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Now, divide the difference by the old value: \[ \frac{1.35}{8.50} \approx 0.158823529 \]
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Finally, multiply by 100 to get the percentage: \[ 0.158823529 \times 100 \approx 15.88 \]
Now rounding to the nearest hundredth, we find the percent change is approximately 15.88%.
Therefore, the correct response is:
15.88%