Quantitative Aptitude :: Profit and Loss - Discussion

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Explanation:
Let the CP be x.
Gain % = 25%
Then, SP = x*125/100
=> SP = 5x/4
If it had been bought at 10% discount, then
CP = x*90/100
CP = 9x/10
Sold at 20% more that the earliest cost ( at CP = x)
Then SP = x*120/100 = 600+(9x/10).
=> 6x/5 = (6000+9x/10).
=> 12x = 6000+9x.
=> 3x = 6000.
=> x = 2000.