This month's IEEE GlobalSpec Newsletter Challenge is:
Lance sells Eddy a bike for $100. A few days later, Eddy discovers some mechanical issues and sells it back to Lance for $80. Ever the opportunist, Lance then sells the same bike to Bernard for $90.
What is Lance's total profit?
Hint: this is something of a trick question, with three possible answers. Can you guess them all?
And the answer is:
As stated above, there are several interpretations of this puzzle.
1. The original cost of the bike is unknown. What is known is that Lance bought it back for $80 and solid it for $90, so he definitely made a $10 profit.
2. Lance originally sold his bike for $100 and then bought it back for $80, so he made $20. The next transaction is irrelevant because the bike's original is unknown.
3. After Lance made his original $20 profit from Eddy's sale, he sold it to Bernard for $10 more than he just paid for it, so his total profit is $30.
This is essentially a semantic problem in that the correct answer depends on a personal definition of "total profit." Only by knowing the bike's original value can an exact profit be ascertained.
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