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 $30,000 per book.  How much money has he made writing?
He writes 12/2=<T>divide(12, 2)=6.0 books a year
That means he has written 6*20=<T>multiply(6, 20)=120 books
So he has made 120*30,000=$<T>multiply(120, 30000)=3600000 from writing
