Given :
Cost , c = $299 .
The total including sales tax was 1.07 times the price.
A discount was then applied by multiplying the total price by 0.90.
To Find :
The total cost of the game system including the sales tax and discount.
Solution :
Cost after tax ,
.
Cost after discount ,
.
Therefore , the total cost of the game system including the sales tax and discount is $287.937 .
Hence , this is the required solution .