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MATHS
Asked by Gaby

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 !

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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

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Pellumb Ahmetaj
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