Using decimal multipliers, it is found that the expression that can be used to determine the final cost of the game is given by:
Decimal multipliers:
- The equivalent multiplier for an increase of a% is given by: [tex]\frac{100 + a}{100}[/tex]
- The equivalent multiplier for an decrease of a% is given by: [tex]\frac{100 - a}{100}[/tex]
In this problem:
- Purchase for 18% off, hence decrease of 18%, that is, [tex]\frac{100 - 18}{100} = 0.82[/tex].
- Sales tax of 8%, hence, an increase of 8%, that is, [tex]\frac{100 + 8}{100} = 1.08[/tex].
Applying both multipliers, the expression is:
[tex]C = y(0.82)(1.08) = 0.8856y[/tex]
To learn more about decimal multipliers, you can take a look at https://brainly.com/question/19808269