Steve's new book sells 1,000,000 copies.  He got an advance to pay for 100,000 copies. He gets $2 for each copy of the book sold.  His agent takes 10% of that.  How much money did he keep not counting the money from the advance?
He sold 1,000,000-100,000=<T>subtract(1000000, 100000)=900000 not counting the advance
So he made 900,000*2=$<T>multiply(900000, 2)=1800000 from selling the books
His agent took 1,800,000*.1=$<T>multiply(1800000, 0.1)=180000.0
That means he kept 1,800,000-180,000=$<T>subtract(1800000, 180000)=1620000
