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The easiest and simplest way to calculate a percentage of any number is to remember that 10% of any number, is the number itself with the decimal point one place to the left.

  • I.e 10% of 1478 is 147.8 (The decimal one place to the left)
  • 10% of 100,000,000 is 10,000,000.

That means that 10% of 80.00 is 8.000 (keeping the insignificant digits). So 20% would be $16.00. But we need 5 percent more, so we just split our 10% in half. Half of 8 is 4. So 25% of 80.00 is 16 + 4 which is 20.
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9y ago

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