Answer:
GameStop is better buy to buy Xbox One with final price of $315.35.
Step-by-step explanation:
For GameStop shop:
Given:
Original price = $350
Discount percent = 15%
Sales tax = 6%
We need to find the Total Cost of X box at GameStop shop.
First we will find Discounted price of X box.
Discounted price of X box can be calculated by Discount percent multiplied by Original price and then divided by 100.
framing in equation form we get;
Discount price = 
Price of X box after discount = Original price - Discounted price = 
Sales tax = 6%
Sales tax amount = 
Total Cost of the X box is equal to Price of X box after discount plus Sales tax amount.
framing in equation for we get;
Total Cost of the X box at GameStop = 
Hence Total Cost of X box One at GameStop shop is $315.35.
For Best buy Online:
Given:
Price of X box One = $310
Sales tax = 9%
Amount of sales tax = 
Total Cost of the X box is equal to Price of X box plus Sales tax amount.
framing in equation form we get;
Total Cost of the X box at Best Buy Online = 
Hence Total Cost of X box One at Best Buy is $337.9.
By Comparing Total Cost of X box One at GameStop shop and Total Cost of X box One at Best Buy we can see that Total Cost of X box One at GameStop shop is less than Total Cost of X box One at Best Buy.
Hence GameStop is better buy to buy Xbox One.