Final answer:
To find the total cost of the outfit, multiply the cost of the outfit by the sales tax rate and add the sales tax to the cost of the outfit.
Step-by-step explanation:
To find the total cost of the outfit, first calculate the amount of sales tax. Start by converting the percentage to a decimal: 5.3% becomes 0.053. Then, multiply the cost of the outfit ($139.28) by the sales tax rate (0.053) to find the amount of sales tax. Finally, add the amount of sales tax to the cost of the outfit to get the total amount Carmen will pay.
Amount of sales tax = $139.28 x 0.053 = $7.3664
Total cost of outfit = $139.28 + $7.3664 = $146.6464