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2014-11-19T18:09:57+05:30

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CP is the cost price.
Gain% =  CP%
 Gain or profit = CP * CP/100
SP = CP + profit = CP + CP²/100  = 24

CP² + 100 CP - 2400 = 0 

 CP = [ -100 +- √(10,000 + 9, 600) ] /2 
     =  20   taking only the positive  value.

So Rs 20 is the cost price and 20% is the gain.

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CP² + 100 CP - 2, 400 = 0

(CP - 20) ( CP ( + 1200) = 0   So CP = 20.

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