posted by Anonymous .
A video games price was 90$. The store offered 10% discount. How much did a costumer pay if there was a 8% sales tax on the selling price?
10% of $90 = a (90 x .10)
$90 - a = b
b x .08 = sales tax
To add to what Writeacher said,
Multiply b x 1.08 and that will give you the total price. That will save you a step.