1. Simple interest and simple discount -- 2. Compound interest -- 3. Annuities -- 4. More annuity problems -- 5. General annuities -- 6. Housing and other personal loans -- 7. Bonds -- 8. Business decisions and compound interest -- 9. contigent payments. Appendix A: Exponents and logarithms. Appendix B: Progressions. Appendix C: Linear interpolation. Appendix D: Continuous cojmpounding. Appendix E: The number of each day of the year.