Final answer:
To find the total cost of the smart watch, add the price of the watch to the amount of sales tax. The total cost of the smart watch is $117.13.
Step-by-step explanation:
To find the total cost of the smart watch, we need to add the price of the watch to the amount of sales tax. First, let's calculate the amount of sales tax by multiplying the price of the watch by the sales tax rate in decimal form.
Sales tax = $109.99 imes 0.065 = $7.14
Next, we can find the total cost by adding the price of the watch and the sales tax amount.
Total cost = $109.99 + $7.14 = $117.13