Quantitative Aptitude :: Percentage - Discussion

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Explanation:
Lets assume the original price of the jewel = Rs. P
and profit earned by the third seller= x%.

Then, ( 100 +x )% of 125% of 120% of P = 165% of p
=> [ ( 100+x )/100*125/100*120/100* P ] = [ 165/100* P ]
=> ( 100 + X ) = (165*100*100)/(125*120) = 110,
=> X = 10%.