anonymous
  • anonymous
How can you quickly calculate 20 percent of any bill amount?
Geometry
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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Hero
  • Hero
Suppose you have $25. Move the decimal one place to the left to get 10%. Now you have $2.50 Multiply that by 2 to get 20%. Now you have $5
SolomonZelman
  • SolomonZelman
divide by 5 (I suppose).
SolomonZelman
  • SolomonZelman
either way... would have been better using an american computer and keyboard tho. bye:)

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terenzreignz
  • terenzreignz
Will it be easier to do Hero's method in reverse? ie Double it first and then move the dot?
Hero
  • Hero
If you want to find 30% of $25, again move the decimal one to the left: $2.50. Then multiply by 3 to get $7.50
Hero
  • Hero
The point is, it is possible to do this in your head without a calc.
Hero
  • Hero
Finding percentages of numbers can be a "mental math" activity.

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