A large bottle of dragon mouth was is 5.00 before tax and 5.30 after tax. What is the percentage of tax

Okay. To find the percent of change, you have to set up a proportion and set it up like this: change/original = x/100. The change is the difference between the numbers. 5.30 - 5.00 is 0.30. The amount of change is 30 cents (0.30). The original price was $5.00. Now let's set up the proportion. 0.30/5.00 = x/100. Cross multiply the values in order to get 30 = 5x. Now, divide each side by 5 to isolate the "x". When you do that, you get x = 6. There. The tax rate is 6%.