do you know how to write a book and make money?

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hei,everybody, Do you know hot to write a book and make money? I just finshed this program and i have sold three books earning 84 yuan(=$21).I posted my ad in my personal blog(http://kinstrace.blogspot.com), at the same time i posted the same ad on some discussion to attractive the potential customers.This is an interesting thing.When you got the call, then you will get the money into your bank account. Now i share this good news with you,i hope you can write a book and make money. if you have a good way to make money, please tell me. tahnks@