In: Finance
A loan is being repaid by the amortization method with an installment at the end of each 80 quarters at 6% annual effective interest, the first payment one quarter after the loan is made. In which payment are the principal and the interest most nearly equal to each other?
ANS: 33 Please show the steps.
Effective Interest Rate = [(1+Interest Rate)^Number of times Compounded in a year]-1
0.06 = [(1+i)^4]-1
1.06^1/4 = 1+i
Therefore, Quarterly Interest = i = 1.01467-1 = 0.01467 = 1.467%
Lets Assume a loan of $100 is borrowed,
EMI = P*i*(1+i)^n/[{(1+i)^n}-1]
Where,
P = Principal = 100
i= Interest Rate = 0.01467
n= Number of periods = 80
Therefore, EMI = 100*0.01467*(1+0.01467)^80/[{(1+0.01467)^80}-1]
= 1.467*(3.20616)/[3.20616-1] = 4.70344/2.20616 = $2.131958
Amortization Schedule will be:
| Period | 
Opening Principal (previous closing)  | 
Interest (opening*0.01467)  | 
Installment | 
Principal Repayment (installment-interest)  | 
Closing Principal (opening-principal repayment)  | 
| 1 | 100 | 1.467 | 2.131958 | 0.664958 | 99.335042 | 
| 2 | 99.335042 | 1.457245066 | 2.131958 | 0.67471293 | 98.6603291 | 
| 3 | 98.6603291 | 1.447347027 | 2.131958 | 0.68461097 | 97.9757181 | 
| 4 | 97.9757181 | 1.437303784 | 2.131958 | 0.69465422 | 97.2810639 | 
| 5 | 97.2810639 | 1.427113207 | 2.131958 | 0.70484479 | 96.5762191 | 
| 6 | 96.5762191 | 1.416773134 | 2.131958 | 0.71518487 | 95.8610342 | 
| 7 | 95.8610342 | 1.406281372 | 2.131958 | 0.72567663 | 95.1353576 | 
| 8 | 95.1353576 | 1.395635696 | 2.131958 | 0.7363223 | 94.3990353 | 
| 9 | 94.3990353 | 1.384833848 | 2.131958 | 0.74712415 | 93.6519111 | 
| 10 | 93.6519111 | 1.373873536 | 2.131958 | 0.75808446 | 92.8938267 | 
| 11 | 92.8938267 | 1.362752437 | 2.131958 | 0.76920556 | 92.1246211 | 
| 12 | 92.1246211 | 1.351468192 | 2.131958 | 0.78048981 | 91.3441313 | 
| 13 | 91.3441313 | 1.340018406 | 2.131958 | 0.79193959 | 90.5521917 | 
| 14 | 90.5521917 | 1.328400652 | 2.131958 | 0.80355735 | 89.7486344 | 
| 15 | 89.7486344 | 1.316612466 | 2.131958 | 0.81534553 | 88.9332888 | 
| 16 | 88.9332888 | 1.304651347 | 2.131958 | 0.82730665 | 88.1059822 | 
| 17 | 88.1059822 | 1.292514758 | 2.131958 | 0.83944324 | 87.2665389 | 
| 18 | 87.2665389 | 1.280200126 | 2.131958 | 0.85175787 | 86.4147811 | 
| 19 | 86.4147811 | 1.267704838 | 2.131958 | 0.86425316 | 85.5505279 | 
| 20 | 85.5505279 | 1.255026244 | 2.131958 | 0.87693176 | 84.6735961 | 
| 21 | 84.6735961 | 1.242161655 | 2.131958 | 0.88979634 | 83.7837998 | 
| 22 | 83.7837998 | 1.229108343 | 2.131958 | 0.90284966 | 82.8809501 | 
| 23 | 82.8809501 | 1.215863539 | 2.131958 | 0.91609446 | 81.9648557 | 
| 24 | 81.9648557 | 1.202424433 | 2.131958 | 0.92953357 | 81.0353221 | 
| 25 | 81.0353221 | 1.188788175 | 2.131958 | 0.94316982 | 80.0921523 | 
| 26 | 80.0921523 | 1.174951874 | 2.131958 | 0.95700613 | 79.1351462 | 
| 27 | 79.1351462 | 1.160912594 | 2.131958 | 0.97104541 | 78.1641008 | 
| 28 | 78.1641008 | 1.146667358 | 2.131958 | 0.98529064 | 77.1788101 | 
| 29 | 77.1788101 | 1.132213144 | 2.131958 | 0.99974486 | 76.1790653 | 
| 30 | 76.1790653 | 1.117546887 | 2.131958 | 1.01441111 | 75.1646541 | 
| 31 | 75.1646541 | 1.102665476 | 2.131958 | 1.02929252 | 74.1353616 | 
| 32 | 74.1353616 | 1.087565755 | 2.131958 | 1.04439225 | 73.0909694 | 
| 33 | 73.0909694 | 1.072244521 | 2.131958 | 1.05971348 | 72.0312559 | 
| 34 | 72.0312559 | 1.056698524 | 2.131958 | 1.07525948 | 70.9559964 | 
| 35 | 70.9559964 | 1.040924467 | 2.131958 | 1.09103353 | 69.8649629 | 
| 36 | 69.8649629 | 1.024919006 | 2.131958 | 1.10703899 | 68.7579239 | 
| 37 | 68.7579239 | 1.008678743 | 2.131958 | 1.12327926 | 67.6346446 | 
| 38 | 67.6346446 | 0.992200237 | 2.131958 | 1.13975776 | 66.4948869 | 
| 39 | 66.4948869 | 0.97547999 | 2.131958 | 1.15647801 | 65.3384089 | 
| 40 | 65.3384089 | 0.958514458 | 2.131958 | 1.17344354 | 64.1649653 | 
| 41 | 64.1649653 | 0.941300041 | 2.131958 | 1.19065796 | 62.9743074 | 
| 42 | 62.9743074 | 0.923833089 | 2.131958 | 1.20812491 | 61.7661824 | 
| 43 | 61.7661824 | 0.906109897 | 2.131958 | 1.2258481 | 60.5403343 | 
| 44 | 60.5403343 | 0.888126705 | 2.131958 | 1.2438313 | 59.296503 | 
| 45 | 59.296503 | 0.8698797 | 2.131958 | 1.2620783 | 58.0344247 | 
| 46 | 58.0344247 | 0.851365011 | 2.131958 | 1.28059299 | 56.7538318 | 
| 47 | 56.7538318 | 0.832578712 | 2.131958 | 1.29937929 | 55.4544525 | 
| 48 | 55.4544525 | 0.813516818 | 2.131958 | 1.31844118 | 54.1360113 | 
| 49 | 54.1360113 | 0.794175286 | 2.131958 | 1.33778271 | 52.7982286 | 
| 50 | 52.7982286 | 0.774550013 | 2.131958 | 1.35740799 | 51.4408206 | 
| 51 | 51.4408206 | 0.754636838 | 2.131958 | 1.37732116 | 50.0634994 | 
| 52 | 50.0634994 | 0.734431537 | 2.131958 | 1.39752646 | 48.665973 | 
| 53 | 48.665973 | 0.713929823 | 2.131958 | 1.41802818 | 47.2479448 | 
| 54 | 47.2479448 | 0.69312735 | 2.131958 | 1.43883065 | 45.8091141 | 
| 55 | 45.8091141 | 0.672019704 | 2.131958 | 1.4599383 | 44.3491758 | 
| 56 | 44.3491758 | 0.65060241 | 2.131958 | 1.48135559 | 42.8678203 | 
| 57 | 42.8678203 | 0.628870923 | 2.131958 | 1.50308708 | 41.3647332 | 
| 58 | 41.3647332 | 0.606820636 | 2.131958 | 1.52513736 | 39.8395958 | 
| 59 | 39.8395958 | 0.584446871 | 2.131958 | 1.54751113 | 38.2920847 | 
| 60 | 38.2920847 | 0.561744882 | 2.131958 | 1.57021312 | 36.7218716 | 
| 61 | 36.7218716 | 0.538709856 | 2.131958 | 1.59324814 | 35.1286234 | 
| 62 | 35.1286234 | 0.515336906 | 2.131958 | 1.61662109 | 33.5120023 | 
| 63 | 33.5120023 | 0.491621074 | 2.131958 | 1.64033693 | 31.8716654 | 
| 64 | 31.8716654 | 0.467557331 | 2.131958 | 1.66440067 | 30.2072647 | 
| 65 | 30.2072647 | 0.443140574 | 2.131958 | 1.68881743 | 28.5184473 | 
| 66 | 28.5184473 | 0.418365622 | 2.131958 | 1.71359238 | 26.8048549 | 
| 67 | 26.8048549 | 0.393227222 | 2.131958 | 1.73873078 | 25.0661241 | 
| 68 | 25.0661241 | 0.367720041 | 2.131958 | 1.76423796 | 23.3018862 | 
| 69 | 23.3018862 | 0.34183867 | 2.131958 | 1.79011933 | 21.5117669 | 
| 70 | 21.5117669 | 0.31557762 | 2.131958 | 1.81638038 | 19.6953865 | 
| 71 | 19.6953865 | 0.28893132 | 2.131958 | 1.84302668 | 17.8523598 | 
| 72 | 17.8523598 | 0.261894118 | 2.131958 | 1.87006388 | 15.9822959 | 
| 73 | 15.9822959 | 0.234460281 | 2.131958 | 1.89749772 | 14.0847982 | 
| 74 | 14.0847982 | 0.20662399 | 2.131958 | 1.92533401 | 12.1594642 | 
| 75 | 12.1594642 | 0.17837934 | 2.131958 | 1.95357866 | 10.2058855 | 
| 76 | 10.2058855 | 0.149720341 | 2.131958 | 1.98223766 | 8.22364787 | 
| 77 | 8.22364787 | 0.120640914 | 2.131958 | 2.01131709 | 6.21233078 | 
| 78 | 6.21233078 | 0.091134893 | 2.131958 | 2.04082311 | 4.17150767 | 
| 79 | 4.17150767 | 0.061196018 | 2.131958 | 2.07076198 | 2.10074569 | 
| 80 | 2.10074569 | 0.030817939 | 2.13156363 | 2.10074569 | 0 | 
It is clear from the Amortization Schedule that Interest and Principal Repayment is almost same in 33rd payment
Therefore, 33rd Payment