the answer is -$97 for sure.
# F. B6 \" a+ P公仔箱論壇Think about it this way 0 N, a+ L- D. o6 d
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
) q, w. g$ e* t1 J. y2) Now, the owner discovered that the 100 bucks is fake. You can think this as a lost of $100. therefore the overall gain is $3-$100 = -$97 |
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