a number is increse by 20% .by what per cent the new number is decresed so that the number restores the original value
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let original number = 100
after 20% increase, it becomes 120
so you need to decrease = 20/120 × 100 = 16.67%
after 20% increase, it becomes 120
so you need to decrease = 20/120 × 100 = 16.67%
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