the answer is -$97 for sure.
) p4 g" f, i1 V, S5.39.217.77Think about it this way
; I, x6 A! f( c2 b6 P- Q5.39.217.771) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)
! U/ F$ J. F. J& N/ |8 M# O5 Z2) 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
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發表於 2007-5-21 03:49 AM
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