Since your bill is $30 and the tax value is 5.25% of the bill, you would first convert 5.25% to a decimal. This would be 0.0525 since you move the decimal right twice. The next thing you have to do is to find the value of the tax. To do this, multiply the decimal 0.0525 to the bill, 30. This would be about $1.58. Now that you know the tax value, add this to the bill and you get the total amount of the purchase as $31.58 :) Hope this helps!
