Final answer:
To calculate the total cost of Xavier's clothing purchase, multiply the subtotal by the discount percentage, subtract the discount amount from the subtotal, calculate the sales tax by multiplying the discounted price by the tax rate, and then add the discounted price and the sales tax.
Step-by-step explanation:
To calculate the total cost of Xavier's clothing purchase, first calculate the discount amount by multiplying the subtotal by the percentage discount. $115.50 x 0.20 = $23.10. Then subtract the discount amount from the subtotal to get the discounted price. $115.50 - $23.10 = $92.40. Next, calculate the sales tax by multiplying the discounted price by the tax rate. $92.40 x 0.0825 = $7.623. Finally, add the discounted price and the sales tax to get the total amount Xavier will pay. $92.40 + $7.623 = $99.02.