In: Economics
Tommy, a former student in Dr. Smith from Economy class, opened an account at First National Bank on July 1, 2008 and made an initial deposit of $500. She then made 8 additional yearly deposits beginning with July 1, 2009. The first additional deposit was $1,000 and this decreased by $100 per deposit after that. The bank paid a nominal interest rate of 4% compounded quarterly through July 1, 2014. After July 1, 2014 it changed the nominal rate to 3.0% compounded monthly.
Immediately after making the last deposit (total 9 deposits), Sally decided to close out his account on July 1, 2016. Using Excel functions, determine how much money Sally received when she closed out the account.
Using Excel functions
| Effective interest rate till July 1,2014 | 4.060% |
| Effective interest rate after July 1,2014 | 3.042% |
| Date | Deposit |
| 1 July,2008 | 500 |
| 1 July,2009 | 1000 |
| 1 July,2010 | 900 |
| 1 July,2011 | 800 |
| 1 July,2012 | 700 |
| 1 July,2013 | 600 |
| 1 July,2014 | 500 |
| 1 July,2015 | 400 |
| 1 July,2016 | 300 |
| NPV of cash flow from Jul 1, 2008 to Jul 1,2014 | 4,484.56 |
| NPV of cash flow from Jul 1, 2015 to Jul 1,2016 | 528.25 |
| Total NPV | 5,012.81 |
| Future worth | 12,923.48 |
Showing formula in excel
| Effective interest rate till July 1,2014 | =EFFECT(4%,4) |
| Effective interest rate after July 1,2014 | =EFFECT(3%,12) |
| Date | Deposit |
| 1 July,2008 | 500 |
| 1 July,2009 | 1000 |
| 1 July,2010 | =F5-100 |
| 1 July,2011 | =F6-100 |
| 1 July,2012 | =F7-100 |
| 1 July,2013 | =F8-100 |
| 1 July,2014 | =F9-100 |
| 1 July,2015 | =F10-100 |
| 1 July,2016 | =F11-100 |
| NPV of cash flow from Jul 1, 2008 to Jul 1,2014 | =NPV(F1,F5:F10)+F4 |
| NPV of cash flow from Jul 1, 2015 to Jul 1,2016 | =PV(F1,6,,-(NPV(F2,F11:F12))) |
| Total NPV | =F14+F15 |
| Future worth | =FV(F2,2,-FV(F1,6,,-F16)) |