1. Annuities – the “Future Value” of periodic deposits Mat 112

2. First, a note To compute a particular type of sum (a “geometric sum”), where the terms are powers of some number, such as: The total is simply given by

3. Annuities

4. Forming a “future value”

5. Making Deposits

6. First Deposit

7. Second Deposit

8. And so on…

9. …for a total of ?

10. Interest Earned?

11. Future Value formula Why? Results from determining the geometric sum.

12. Given FV, find PMT

13. FV formula

14. Examples for Future Value Mat 112

15. FV Example

16. How much interest?

17. PMT Example

18. Calculate carefully! PMT = $104.31 (or round up to $104.32 to be safe)

19. Example: “quarterly deposits”

20. Example: “IRA”

21. Solving for n? Mat 112

22. A Bigger Challenge?

23. Using the Log… Or simply,

24. Bring down the exponent

25. Not Another Formula? Although the text offers this result as a new formula and we could memorize It seems more reasonable to just solve this exponential equation in the usual way.

26. Does it Check?