In: Finance
A wishes to accumulate exactly $15,000 in a fund that credits interest at a nominal annual rate of 6% compounded semiannually. A makes annual deposits of $1,000 at the beginning of each year into the fund, plus a final smaller deposit one year after the last $1,000 deposit. In which of the following ranges is the amount of the final deposit?
Effective Interest Rate or EAR = [{1+(APR/n)}^n]-1
Where, APR = Annual Interest Rate or Nominal Rate, n = Number of times compounded in a year
Therefore,
For Semi Annual,
EAR = [{1+(0.06/2)}^2]-1 = 0.0609 = 6.09%
Period | Deposit/(Withdrawal) [beginning of period] |
Opening Balance [Previous Closing+/-Deposit/Withdrawal] |
Interest [Opening Balance*(0.0609)] |
Closing Balance [Opening Balance+Interest] |
1 | 1000 | 1000 | 60.9 | 1060.9 |
2 | 1000 | 2060.9 | 125.50881 | 2186.40881 |
3 | 1000 | 3186.40881 | 194.0522965 | 3380.461107 |
4 | 1000 | 4380.461107 | 266.7700814 | 4647.231188 |
5 | 1000 | 5647.231188 | 343.9163793 | 5991.147567 |
6 | 1000 | 6991.147567 | 425.7608868 | 7416.908454 |
7 | 1000 | 8416.908454 | 512.5897249 | 8929.498179 |
8 | 1000 | 9929.498179 | 604.7064391 | 10534.20462 |
9 | 1000 | 11534.20462 | 702.4330612 | 12236.63768 |
10 | 1000 | 13236.63768 | 806.1112347 | 14042.74891 |
11 | =15000-14042.75 = $957.25 | 15000 |
Therefore, Last Small Deposit = $957.25