To calculate the total purchase amount, we can follow these steps:
Step 1: Determine the original price of the three cans of paint.
Each can is priced at $29.00, so the original price of all three cans would be: 3 cans * $29.00 = $87.00.
Step 2: Subtract the discount amount from the original price.
The customer has a coupon for $15 off the purchase, so we subtract $15.00 from $87.00 to find the discounted price: $87.00 - $15.00 = $72.00.
Step 3: Calculate the sales tax on the discounted price.
The sales tax is 8%, so we need to find 8% of $72.00.
To do this, we multiply $72.00 by 8% (or 0.08): $72.00 * 0.08 = $5.76.
Step 4: Add the discounted price and the sales tax to find the total purchase amount.
To find the total purchase amount, we add the discounted price ($72.00) and the sales tax ($5.76): $72.00 + $5.76 = $77.76.
Therefore, the total purchase amount is $77.76.