Money Doesn't Grow on Mars (How to Be an Earthling Series #8)

Making money is easy! Jack gets two dollars to sweep the sidewalk, a dollar to take out trash, five dollars to dust. Soon he'll have enough to buy a special copy of his favorite comic book! Jack has it all under control, unlike Spork, who's crazy for video games. But Jack forgot one thing. Making money may be easy. Keeping it is hard!