To find the percent change in Jess's hourly wages, you can use the following formula:
\[ \text{Percent Change} = \frac{\text{New Value} - \text{Old Value}}{\text{Old Value}} \times 100 \]
In this case, the old value is $8.50 and the new value is $9.85.
Plugging in the values:
\[ \text{Percent Change} = \frac{9.85 - 8.50}{8.50} \times 100 \]
Calculating the numerator:
\[ 9.85 - 8.50 = 1.35 \]
Now plug that back into the formula:
\[ \text{Percent Change} = \frac{1.35}{8.50} \times 100 \]
Calculating the fraction:
\[ \frac{1.35}{8.50} \approx 0.1588235294 \]
Now multiply by 100 to convert to percent:
\[ 0.1588235294 \times 100 \approx 15.88235294 \]
Rounding to the nearest hundredth:
\[ 15.88% \]
So the percent change in Jess's hourly wages is 15.88%.