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Anonymous
It means: 80 plus 90 = 170
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The increase from 50 to 90 is: 80%
80% increase.
80% of 90m = 80% * 90 = 0.8 * 90 = 72m
80% of 90 Euros= 80% * 90 Euros= 0.8 * 90 Euros= 72 Euros
80 is 88.9% of 90.