To calculate the sales tax on Bailey's order, you can use the following formula:
Sales Tax = (Total Cost) × (Sales Tax Rate)
In this case, the total cost is $21.25, and the sales tax rate is 9%, which can be expressed as a decimal (0.09).
So the sales tax calculation would be:
Sales Tax = $21.25 × 0.09 = $1.9125
Rounding it to two decimal places, Bailey will owe approximately $1.91 in sales tax.
Thus, the answer is:
A: $1.91