the answer is -$97 for sure. 公仔箱論壇8 b) S- x {0 y- w; _* J
Think about it this way 5.39.217.76( @. R; x0 y6 v8 j
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)5.39.217.761 Y1 C3 r7 \1 V" K
2) 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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