Time value of money. Introduction to Present Value. Present Value 2. Present Value 3. Present Value 4 (and discounted cash flow) Credit cards and loans. Introduction to interest. Interest (part 2) Compound. Introduction to compound interest and e. Compound Interest and e (part 2) Compound Interest and e (part 3) Compound Interest and e (part 4) Compound interest basics. The rule of 72 for compound interest.