The sales tax on a sofa that cost $575 was $43.13. What was the percent sales tax?

It is important to look at all details given in the question very carefully.

Amount of sales tax taken on the sofa = $43.13

Actual cost of the sofa = $575

Let us assume the percentage of sales tax taken = x%

Then

(x/100) * 575 = 43.13

5.75x = 43.13

x = 43.13/5.75

= 7.50 percent

So the percentage of sales tax charged for the sofa was 7.50%. I hope the procedure is clear enough for you to understand. Based on this procedure, similar problems can be done with absolute ease.