To calculate the percentage change in Last year's hourly wage, you can use the formula:
\[ \text{Percentage Change} = \frac{\text{New Wage} - \text{Old Wage}}{\text{Old Wage}} \times 100 \]
Substituting in Last year's wages:
- Old Wage = $8.50
- New Wage = $9.85
Now, plug in the values:
\[ \text{Percentage Change} = \frac{9.85 - 8.50}{8.50} \times 100 \]
Calculate the difference:
\[ \text{Percentage Change} = \frac{1.35}{8.50} \times 100 \]
Now divide:
\[ \text{Percentage Change} \approx 0.15882 \times 100 \]
Finally, multiply by 100:
\[ \text{Percentage Change} \approx 15.88 \]
So, the percentage change in her hourly wage, rounded to the nearest hundredth, is 15.88%.