91影视

The selling price of an object is given as,

$SP=\left(1鈭�\frac{d}{100}\right)\left(1+\frac{ST}{100}\right)CP$, where $SP$is the selling price, d is the discount percentage, $ST$is the sales tax and $CP$is the cost price.

There is a sale on video games with the offer of 鈥淏uy 2 get 1 free鈥�. The cost price of a video game is $20. Employee discount is $15\%$and sales tax is $7.25\%$.

Then, $d=15$and $ST=7.25$.

Maddie purchases 4 video games. There is an offer of 鈥淏uy 2 get 1 free鈥� on video games. Then, the third video game is free and Maddie effectively purchases 3 games.

The cost price of one video game is $20. Then, the cost price of 3 video games is $60.

So, $CP=60$.

Put $d=15$, $ST=7.25$and $CP=60$in $SP=\left(1鈭�\frac{d}{100}\right)\left(1+\frac{ST}{100}\right)CP$to get,

role="math" localid="1642686257308" $$\begin{gathered} SP=\left(1鈭�\frac{15}{100}\right)\left(1+\frac{7.25}{100}\right)60 \\ =\left(1鈭�0.15\right)\left(1+0.0725\right)60 \\ =\left(0.85\right)\left(1.0725\right)60 \\ =54.6975 \end{gathered}$$

So, $SP=54.6975$

Rounding off to nearest tenth, $SP=54.7$.

So, Maddie spends $54.7 on video games.