Final answer:
To find the total cost of the bicycle including sales tax, calculate the sales tax by multiplying the price ($129.99) by the sales tax rate (6%), which gives $7.80 after rounding. Adding the sales tax to the original price gives a total cost of $137.79.
Step-by-step explanation:
To calculate the total amount Samantha will pay for the bicycle including sales tax, you first need to find the amount of sales tax by converting the percentage to a decimal and then multiplying by the price of the bicycle. The sales tax rate is 6%, which as a decimal is 0.06. Therefore, you calculate the sales tax as $129.99 × 0.06, which equals $7.7994. After rounding to the nearest cent, the sales tax is $7.80. Next, you add this amount to the original price to find the total cost.
The original price of the bicycle is $129.99, and the sales tax is $7.80. So, the total cost = original price + sales tax = $129.99 + $7.80 = $137.79.