The first graphic:
compounding where money pratically explodes. By compounding the money goes from a simple penny [1¢] on the first day to over 5 million by day 30! [$5,368,709.12 to be exact].
It is a good teaching tool to warn of the dangers of compounding interest on doans and credit cards. At first most kids will not believe the second graphic so be prepared to hand them a calculator and let them try it themselves.
Image credits: photographed from a 2011 TODAY show segment with Jean Chatzky.