the answer is -$97 for sure.
# N; V# _: U, A' lTVBNOW 含有熱門話題，最新最快電視，軟體，遊戲，電影，動漫及日常生活及興趣交流等資訊。Think about it this way 公仔箱論壇7 P. a4 `$ F. o. e3 L+ B
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
; v5 h: S7 O0 m& Z" P- A# ?公仔箱論壇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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