Question

the sales tax on a piece of furniture that cost $450 was $28.13. what was the percent sales tax?

Answer 1

We could write a percent equation. 
What percent of 450 is 28.13?
$\frac{28.13}{450} = \frac{x}{100}$
Cross multiply and we would get 2813 = 450x
Divide 450 on both sides of the equal sign and x = 6.25111111
Round it
Solution: 6.25% tax