John is a hack author.  He writes a book every 2 months.  He has been writing for 20 years and has earned an average of $30,000 per book.  How much money has he made writing?
He writes 12/2=<<12/2=6>>6 books a year
That means he has written 6*20=<<6*20=120>>120 books
So he has made 120*30,000=$<<120*30000=3600000>>3,600,000 from writing
#### 3600000