You probably know how much money you made last month, but do you know how much money you spent? Or do you know how much money you have left to spend this month? If you don't you're not alone, most people have no idea. The fact is most of us spend 10% more per month than we make. That comes out to $431 per month based on the average American income. No wonder the average credit card debt is now at $8,500!