There are many sources of sites related to the material of this chapter. Here are a few of the better ones. Compound interest calculator:
This calculator uses continuous compounding:
Calculator and graphs for various financial situations:
“How to manage your credit cards.”:
U.S. National Debt Clock:
The simple “one formula fits all” used in this text is good for our purposes, but inflation is more complicated than one simple formula. This site is interesting if you want more information about how inflation is actually calculated.