percentage calculator

What percentage is to ?

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ex) x = 300, y = 30 --> 10%

What is percent of ?

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ex) x = 200%, y = 100 --> 200

What percentage did increase when it became ?

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ex) x = 1000, y = 1100 --> 10%

What if increases by %?

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ex) x = 100, y = 50% --> 150

What if decreases by %?

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ex) x = 100, y = 50% --> 50