Question

The sales tax on a digital camera is $7.15. What is the sales tax rate?

Answer 1

You just have to find out the percent 7.15 is of 105. To do that, you set up a proportion with x as the percentage:


`(7.15)/(105)=(x)/(100)`

Then, cross multiply to get:


`(7.15)/(105)=(x)/(100)\\715=105x\\105x/105=715/105\\x=6.810`

So, the sales tax rate was 6.8%.