mari mari count

this is a sms from my father
everyone should try this out

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这是声称《一百个大学生就有99个回答错误的小学算术题》
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有个顾客到王老板店里买了件礼物，
这礼物成本是18元，标价21元。
这顾客掏出一百元付钱，王老板当时没零钱，
就用那一百元向街坊换了一百元零钱，找给那顾客79元。
但街坊后来发现那一百元是假钞，王老板无奈还了街坊一百元。
请问：王老板在这次交易中损失了多少钱？


how many can get the answer correctly??



omg...
i just found out one theory..
the nearer my final exam is,
the longer time i spend on computer
the equation is....

x = 1/y
where x = facebooking, blogging, games
and y = how long more to finals

omg!!
the x supposed to be study, past year questions, revision!
omg omg omg~~~
hmm... is this theory applicable to everyone?
or to me only....
oh btw i think im a facebook addict...
i will automatically look at it every few minutes...
unconsciously...
hmm...