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Percentages large and small

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The rule never changes

100% is not a ceiling100%old price+75%new price = 175%…and 0.5% is half of ONE per cent, not a half50%0.5 · 1/25%0.05 · 1/200.5%0.005 · 1/200
Whatever the size, the rule is the same: divide by 100.
  1. 1To make a decimal, divide by 100 — however big or small.