Brain Teaser 商业头脑

Brain Teaser
测测你有没有商业头脑!
A test on your business mindedness!

王老板是卖鞋的,一双鞋进价20元卖30元。
Mr. Ong, the boss, is a shoe dealer. A particular pair of shoes costs him $20 & selling for $30.

一顾客来买鞋给了张50,王老板没零钱,于是找邻居换了50元。
One customer came & gave a $50 note to buy a pair of the said shoes. The boss didn’t have small change, so went to the neighbour to get the $50 small change.

事后邻居发现钱是假的,王老板又赔了邻居50。
After the sale, the neighbour realised the $50 is a fake one & the boss has to pay back the neighbour.

请问王老板一共亏了多少? 
Question: How much is the boss’s total loss?

(这道题不简单,100个人有99人会算错)
(This question is not that simple. 99 out of 100 will get it wrong)

到底亏了多少?
So how much is the total loss?

Ans: $100 / $40 / $90 ?

(Scroll down for answer but please try before)
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Answer:

Don’t have to count the fake $50, because Mr.Ong had received real $50 (in loose sum) from his neighbor before, he just have to return $50, so NETT = $50-$50=$0.

Mr.Ong’s total loss = $20 (shoe)+ $20 (changed = $50 – $30 sales price) =$40.

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