the answer is -$97 for sure. ( n2 U) P; S+ O2 e
Think about it this way tvb now,tvbnow,bttvb6 f2 ^2 X% e: K# p. x: r
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
" I2 v- w( m* L0 \6 V0 P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 |
發表於 2007-5-16 03:12 AM
| 
發表於 2007-5-19 03:21 PM
| 
發表於 2007-5-21 03:49 AM
| 