Math like that reminds me of this scene from The Simpsons:
Nelson: Hey, look how much Skinner makes--$25,000 a year! (the kids are impressed)
Bart: (typing into a calculator) Let's see, he's 40 years old, times $25 grand...whoa, he's a millionaire!
Children: Wow!
Principal Skinner: I wasn't a principal when I was one!
Nelson: Plus, in the summer he paints houses.
Milhouse: He's a billionaire!
Children: Wow!
Principal Skinner: If I were a billionaire, why would I be living with my mother? (the kids laugh) They don't seem to listen to logic anymore.