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A number is increased by 18%. To obtain the old number, by how much percentage should it be decreased?1). 16.882). 15.253). 17.34). 14.28 |
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Answer» Given, A number is INCREASED by 18% Let number be n. NEW number = = n + n × (18/100) = 59n/50 To obtain OLD number, Let PERCENTAGE number should be decreased to obtain new number be a. n = 59n/50 - (59n/50) × (a/100) n = (5900n - 59na)/5000 5000n = 5900n - 59na 59na = 900n a = 900n/59n a = 15.25 By 15.25% new number should be decreased to obtain new number. |
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