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2014-08-05T18:27:47+05:30

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CP = cost price
MP = CP + 35% of CP = 135/100 * CP = 1.35 CP
discount = 15%  of MP = 15 /100 * MP = 0.15 * 1.35 CP  = 0.2025 CP
sale price SP = MP - discount  =  1.35 CP - 0.2025 CP = 1.1475 CP
profit or gain = SP  - CP  = 1.1475 C P - CP  = 0.1475 CP

He gained Rs 88.50  => 0.1475 CP = 88.50
CP cost price =  88.50 / 0.1475 = Rs 600

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