To calculate the sales tax on Bailey's order, you can use the following formula:
\[ \text{Sales Tax} = \text{Cost} \times \text{Sales Tax Rate} \]
In this case:
- Cost = $21.25
- Sales Tax Rate = 9% = 0.09
Now, plug in the numbers:
\[ \text{Sales Tax} = 21.25 \times 0.09 \]
\[ \text{Sales Tax} = 1.9125 \]
Rounding this to the nearest cent, Bailey would owe approximately $1.91 in sales tax.
So the correct answer is d) $1.91.