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Mathematics - Easy Way to Calculate a 15% Tip
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Easy Way to Calculate a 15% Tip

Mathematics

Work out 10% (divide the number by 10) – then add that number to half its value and you have your answer:
15% of $25 = (10% of 25) + ((10% of 25) / 2)
$2.50 + $1.25 = $3.75

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