πŸ’― Maths

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?

3 answers
Answered Feb 19Maths
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Dr. Badi MExperienced Academic and dedicated tutor for all levels.

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

Answered Feb 19Maths
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Pellumb AhmetajQTS Secondary school Head of Maths teacher with 5 years experience πŸ’ͺπŸ’―143 students helped

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

Answered May 18Maths
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Imdad AhadBackend Developer | Worked for GOV UK Notify, BT, Shell, GE | BSc Comp Sci

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 don’t 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.