Final answer:
To find the total cost after the discount and sales tax, subtract the discount from the original cost and then add the sales tax.
Step-by-step explanation:
To find the total cost after the discount and sales tax, we need to follow these steps:
Calculate the discount:
$15.00 - $3.00 = $12.00
Calculate the sales tax:
$12.00 * 0.06 = $0.72
Add the discount and sales tax to the original cost:
$12.00 + $0.72 = $12.72