Final answer:
To determine the total cost of an item including sales tax, convert the tax percentage to a decimal, multiply it by the item's price to get the tax amount, and add this to the original price.
Step-by-step explanation:
The question pertains to calculating the total cost including sales tax for an item, in this case, a TV antenna. To find the total price with sales tax, we typically add the tax amount to the original price.
First, we convert the sales tax percentage to a decimal by dividing it by 100. Then, we multiply the original price by this decimal to determine the tax amount. Finally, we add the tax to the original price to get the total price paid.
For example, if an antenna costs $20.98 and the sales tax is 7.5%, we convert 7.5% to 0.075 (7.5/100) and then multiply it by $20.98 to find the tax amount, which we then add to $20.98 to find the total cost.
Another example is if Emily bought a jacket for $85.00 with the same sales tax rate, we would calculate the tax as $85.00 times 0.075, which equals $6.375 (rounded to $6.38). We then add this to the original price to find the total cost