When you sell a pen for 72 TK you make twice as much as you

Question

When you sell a pen for 72 TK you make twice as much as you lose when you sell it for 36 TK, how much is the cost of the pen? 
A. 45 TK
B. 44 TK
C. 42
D. 48
E. None of these.

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v12345 · Answer

Let cost be x.
Loss when sold for 36 = y
Gain when sold for 72 = 2y
x + 2y = 72
x - y = 36
Solving, 
x = 48 and y = 12
Cost of pen = 48
Hence, OA is (D).

srisoumyapelluri · Answer

How I solved to get Ans - E, not sure if it is right

let cost price be C, profit be P for 1st equation, SP-CP= P (formula) 72-C= P --------- (1) for 2nd equation, CP-SP=L C-36=L, but L=2P (make twice profit than loss) C-36=2P ----------- (2) After solving, P=12, C=60 and 60TK is not listed, so ans- E

rocky620 · Answer

chetan2u  sir

Can you please help in this one.
Also, how is  v12345 's approach wrong.

Abhishek009 · Answer

IMHO thats the best possible way, alternately we can solve quickly using the options...

Answer has to be (E), cross check using 60 as CP you will get the form....

rocky620 · Answer

Abhishek009

Should it not be  P=2L  rather than  L=2P  . Since it is given that you make twice as much as you loose.

If we say that 60 is the CP then we lost 24, but we gained only 12. Its opposite of the question.
If we say that 48 is the CP then we lost 12, but we gained 24. Its what the question says.

chetan2u · Answer

The question and the OA are incorrect.

A poor quality question and should be avoided.

When you sell a pen for 72 TK you make twice as much as you

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