Final answer:
The total cost of Sam's online purchase, including the discounted price of the cell phone, sales tax, and shipping fee, is $346.05.
Step-by-step explanation:
To find the total cost of Sam's online purchase, we need to go through the steps:
- First, determine the discounted price of Sam's cell phone. Since there is a 20% discount on orders over $200, the discounted price of the cell phone is 80% of $400, which is $320.
- Next, calculate the sales tax on the discounted price. Sam pays 6.5% sales tax, so the sales tax amount is 6.5% of $320, which is $20.80.
- Lastly, add the discounted price, sales tax, and shipping fee ($320 + $20.80 + $5.25) to determine the total cost of Sam's online purchase. This comes out to be $346.05.