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2014-11-10T13:09:09+05:30

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MP or LP = Rs 800
Discount = 15%  
Discount amount =  L P* 15/100 = Rs 800 * 15/100 = Rs 120
Selling price =  LP - discount amount = Rs 800 - Rs 120 = Rs 680

Let Cost Price be CP
Profit made = 40/3 % 
Profit amount =  CP * 40/(3*100 ) = 0.4 CP/3 

Selling Price = SP = CP + profit = CP + 0.4 CP /3 
                   = CP ( 1 + 0.4/3) = CP * (3+ 0.4) / 3
  Hence  680 = CP * 3.4/3 

CP = 3 * 680 / 3.4 = Rs 600

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