Tuesday, August 28, 2007

Answer to the fake note problem

Click here for the question

Got a mail saying that some people at Pagalguy got it right. I dont mind people posting the questions on pagalguy, since it would benifit more people. But if you guys can also put the answers here, it would benifit all and also help me answer queries
Yes the answer is $5. Here are some fundas on how to think simple and not get confused.
1. Lenovo's loss has to be somebody's gain. Dell gained $5 (he started with a fake note ehich was equivalent to 0) and Acer gained/lost nothing.
2. If the note was not fake, no one would have lost anything. The note being fake is equivalent to Acer misplacing the $5.
3. The only thing that got destroyed is the $5 note and hence that is the loss.
Hope it clears things. This problem was just to demonstrate how we make silly mistakes in simple everyday problems. I am sure if you were Acer yourself (a small kirana shop owner), you would have realised your loss amount easier :)

Click here for the question


Anonymous Himanshu said...

Okay, Let's consider the input-output values of real money(discarding the value of $5 fake bill) for Lenovo, the shopowner.

> 5 $1 bills (from Acer) = $5

> 1 $5 bill (to Acer) = $5
> 2 $1 bill (to Dell) = $2
> 1 iPod (to Dell) = value indeterminate.

So, net profit or loss for Lenovo can't exactly be determined as the cost price of iPod isn't given. However, if its value were given, we could have arrived at the exact profit or loss figures for Lenovo.

9:11 AM, September 01, 2007  
Blogger Gyan-ee said...


Though you are right to a certain extent, I would still say that the cost of sourcing IPOD has nothing to do with his loss.

There are various arguments to support this
1. If the note was not fake and the note had been stolen from Lenovo, his loss would have been 5
2. Say, you had got a diamond from your granny and lost it after 5 years. The loss is equal to the current value of diamond and not zero.

2:36 AM, September 03, 2007  

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