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Solve this riddle if u dare c:

deletedabout 10 years

This riddle became so popular in my country later so I'm gonna tell u it and let u try to solve it xD Here we go

A money thief had a fake 100 $ he went to a shop and bought from it's owner a newsletter that costs 10$ as he gave the fake 100$ to the shop owner the shop owner didn't have 90$ he had only solid money so he went to a cafe and gave it's owner the fake 100$ solid and took ten 10$(which means 10 x 10 = 100 x3 ) then the shop owner gave the thief the rest of his money which are 90 $ then after a while the cafe owner came to shop owner and told that 100$ he gave to him is fake so the shop owner gave him another 100$

How much did the shop owner lose?

(I shall answer it after a while xD) if you are confused write in the comments and I will answer (i'm not that good at writing in meaning xD)

deletedabout 10 years
firesheep you're wrong he took fake100$ from thief and gave him a newsletter that costs 10 $ and gave him the rest of his money which is 90 $(not fake) and he took 10$ for himself(remember that he went to the cafe owner and traded)
deletedabout 10 years
Theres no context to find opportunity cost. Itd be his hours away from work
deletedabout 10 years
i didn't concentrate really on punct nor grammar
deletedabout 10 years

Spoiler
If the fake = 0 then. The shop owner has 0, he gets $100 from the cafe. Gives the thief $10. The shop owner now has $90. The cafe wants back the $100. The shop owner gives back the $90 + $10 which = $100.

So, if I'm correct the shop owner lost $20. Newsletter = $10 and the $10 for the $100.
alkair
about 10 years
@EtherealFan gotta take into account the opportunity cost ;)
deletedabout 10 yearsedited
Shop owner lost $90

And a newsletter (costing $~1)
Escurai
about 10 years
Is it a riddle because of the lack of punctuation makes it so hard to understand?
alkair
about 10 years
lost 100 coz the newspaper is worth 10