To find the sales tax, you subtract, the cost without the sales tax from the total cost which is 5.35-5. So the sales tax is 35 cents. To find the tax rate, you need to find what percent of the cost without sales tax is 35 cents. So you do 5x=.35. You find x to be .07. And since you need to change that to a percentage, you multiply be 100 and get 7%. Hope this helps.