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 aswe... more

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... more

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