# I went to a store and bought an item worth $30. I had to pay 9% tax as well. How much did I pay JUST for the tax?

Simply multiply 0.09 by $30 and it gives you $2.7 Which is your tax !

One good way of solving such a question is by using multipliers. If I start on 100% and I have to also pay 9% tax, I end up paying 109% of the price. This as a decimal would be 1.09. Multiplying by 1.09 gives the new increased value. (30 x 1.09 = 32.7). Subtracting the original value from the new gives just the increase. This concept is very practical when working with reverse percentages aswell as questions involving interest or depriciation

If the item costs $30 and you paid tax too, the total of the item is $30 + Tax. To figure out tax, we have to find 9% of 30. If you donβt have a calculator one easy way is to figure out 10% and 1%. 10% - 1% = 9% 10% of 30 is 3.00 1% of 30 is 0.30 3.00 - 0.30 = 2.70 So 9% of 30 is 2.70 We said above the total of the item including tax is $30 + Tax. Since we know that Tax is 2.70, the total is 30 + 2.70 which is 32.70. So the total including tax is $32.70.