- Apr 23, 2004
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For those who are STILL not convinced the answer is $100
The neighbour is irrelavent to the lost. The $100 is cancelled out.
Hence the simplified question is:
A buyer pays for a $21 product (wholesale price $18) with a fake $100 note. The shopkeeper gave him $79 change without realising the note was fake
This question can be answered in 3 seconds
The lost of the shopkeeper is $100
Why not $97? $97 is not wrong BUT it's not optimal
Why?
Let's imagine you are the shopkeeper, I am someone from an insurance company
If I ask how much have you lost overall
You would definitely answer $21 not $18
Common sense tell you that you won't quote wholesell price at all
The neighbour is irrelavent to the lost. The $100 is cancelled out.
Hence the simplified question is:
A buyer pays for a $21 product (wholesale price $18) with a fake $100 note. The shopkeeper gave him $79 change without realising the note was fake
This question can be answered in 3 seconds
The lost of the shopkeeper is $100
Why not $97? $97 is not wrong BUT it's not optimal
Why?
Let's imagine you are the shopkeeper, I am someone from an insurance company
If I ask how much have you lost overall
You would definitely answer $21 not $18
Common sense tell you that you won't quote wholesell price at all