To calculate the percent change in Jess's hourly wages, we can use the formula for percent change:
\[ \text{Percent Change} = \left( \frac{\text{New Value} - \text{Old Value}}{\text{Old Value}} \right) \times 100 \]
Given that her old wage was $8.50 and her new wage is $9.85:
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Calculate the difference: \[ \text{New Value} - \text{Old Value} = 9.85 - 8.50 = 1.35 \]
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Calculate the percent change: \[ \text{Percent Change} = \left( \frac{1.35}{8.50} \right) \times 100 \approx 15.88% \]
Therefore, the percent change in her hourly wages is approximately 15.88%.