A number is decreased from 125 to 100, find the percentage decrease.

10

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20

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30

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None of these

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Solution

The correct option is D $20$ %
$P e r c e n t a g e$ $d e c r e a s e = \frac{D e c r e a s e}{O r i g i n a l n u m b e r}$ $\times 100$
$D e c r e a s e = 125 - 100 = 25$
$O r i g i n a l$ $n u m b e r = 125$
$P e r c e n t a g e$ $d e c r e a s e = \frac{25}{125}$ $\times 100 = 20$ %.

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(i) A number is increased from 125 to 150; find the percentage increase.
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If increasing 20 by P percentage gives the same result as decreasing 60 by P percentage, what percentage is P of 100?

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