How can you quickly calculate 20 percent of any bill amount?

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How can you quickly calculate 20 percent of any bill amount?

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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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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
divide by 5 (I suppose).
either way... would have been better using an american computer and keyboard tho. bye:)

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Other answers:

Will it be easier to do Hero's method in reverse? ie Double it first and then move the dot?
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
The point is, it is possible to do this in your head without a calc.
Finding percentages of numbers can be a "mental math" activity.

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