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What is 18 percent off 109?

Updated: 8/20/2019
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12y ago

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Here is an easy way to always calculate percentages. Always base your percentages off 1%, 5%, and 10%.

In our case we have 18%, which can be composed of 10%, 5%, and 3 - 1%'s.

You can always find 10% of any number by moving the decimal point one place to the left. 5% can be found by simply cutting 10% in half. 1% can be found by moving the decimal point two places to the left.

  • 10% of 109 is 10.9
  • 5% of 109 is 10.9 ÷ 2 = 5.45
  • 1% of 109 is 1.09

So now we throw together our simple math problem.

  • 10.9 (10%) + 5.45 (5%) + (1.09 x 3) (3%)
  • 10.9 + 5.45 = 16.35
  • 16.35 + (1.09 x 3) = 3.27
  • 16.35 + 3.27 = 19.62

Lastly we subtract.

109 - 19.62 = 89.38.

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