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प्रश्न
A number first increases by 20% and then decreases by 20%. Find the percentage increase or decrease on the whole.
उत्तर
Let the number be 100
In 1st condition,
increase = 20% of 100
`= 20/100 xx 100 = 20`
∴ Number after this increase = 100 + 20 = 120
In 2nd condition,
Decrease = 20 % of 120
`= 20/100 xx120 = 24`
∴ Number after this decrease = 120 - 24 = 96
⇒ Total decrease on the whole = 24 - 20 = 4
and the percentage decrease on the whole
`= 4/100 xx 100 = 4%`
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