Final answer:
To calculate the total cost including sales tax, convert the tax rate to a decimal and multiply it by the item's price, then add it to the original price. For a $54 camera with 6% sales tax, Louis pays $57.24 in total. Therefore, the correct option is A.
Step-by-step explanation:
To calculate the total amount Louis pays for a camera with an added 6% sales tax, you first have to convert the sales tax rate from a percentage to a decimal. The conversion is done by dividing the percentage by 100, which turns 6% into 0.06 as a decimal. Then you multiply the camera's cost by this decimal to find the amount of sales tax.
$54 × 0.06 = $3.24
After finding the sales tax, you add it to the original cost of the camera to get the total cost.
$54 + $3.24 = $57.24
Therefore, Louis pays $57.24 in total for the camera.