(a)
$180000 at the end of 48 months | |||||
=180000/1.02 at the end of 36 months | |||||
(as Billy can earn 2% annual return in his investment account.) | |||||
Therfore, Requirement at the end of 36 months = | $1,76,470.59 | ||||
Additional Monthly deposits | $1934.36 | ||||
Month | Investment | FV Factor @ 2% p.a | FV | ||
0 | 100000 | 1.0000 | 100000 | ||
1 | 1934.36 | 1.0050 | 1944.0318 | ||
2 | 1934.36 | 1.0100 | 1953.752 | ||
3 | 1934.36 | 1.0151 | 1963.5207 | ||
4 | 1934.36 | 1.0202 | 1973.3383 | ||
5 | 1934.36 | 1.0253 | 1983.205 | ||
6 | 1934.36 | 1.0304 | 1993.121 | ||
7 | 1934.36 | 1.0355 | 2003.0866 | ||
8 | 1934.36 | 1.0407 | 2013.1021 | ||
9 | 1934.36 | 1.0459 | 2023.1676 | ||
10 | 1934.36 | 1.0511 | 2033.2834 | ||
11 | 1934.36 | 1.0564 | 2043.4498 | ||
12 | 1934.36 | 1.0617 | 2053.6671 | ||
13 | 1934.36 | 1.0670 | 2063.9354 | ||
14 | 1934.36 | 1.0723 | 2074.2551 | ||
15 | 1934.36 | 1.0777 | 2084.6264 | ||
16 | 1934.36 | 1.0831 | 2095.0495 | ||
17 | 1934.36 | 1.0885 | 2105.5248 | ||
18 | 1934.36 | 1.0939 | 2116.0524 | ||
19 | 1934.36 | 1.0994 | 2126.6326 | ||
20 | 1934.36 | 1.1049 | 2137.2658 | ||
21 | 1934.36 | 1.1104 | 2147.9521 | ||
22 | 1934.36 | 1.1160 | 2158.6919 | ||
23 | 1934.36 | 1.1216 | 2169.4854 | ||
24 | 1934.36 | 1.1272 | 2180.3328 | ||
25 | 1934.36 | 1.1328 | 2191.2344 | ||
26 | 1934.36 | 1.1385 | 2202.1906 | ||
27 | 1934.36 | 1.1442 | 2213.2016 | ||
28 | 1934.36 | 1.1499 | 2224.2676 | ||
29 | 1934.36 | 1.1556 | 2235.3889 | ||
30 | 1934.36 | 1.1614 | 2246.5659 | ||
31 | 1934.36 | 1.1672 | 2257.7987 | ||
32 | 1934.36 | 1.1730 | 2269.0877 | ||
33 | 1934.36 | 1.1789 | 2280.4331 | ||
34 | 1934.36 | 1.1848 | 2291.8353 | ||
35 | 1934.36 | 1.1907 | 2303.2945 | ||
36 | 1934.36 | 1.1967 | 2314.8109 | ||
Total | 176470.6 |
Calculation of FV Factor = (1+(0.06/12))^Month No.
Calculation of Monthly Deposit = (176470.59-100000)/aggregate of FV Factors from 1-36 months
b.
If Billy takes out a 30-year, $720,000 mortgage at 4%, his mortgage payments will be,
=PMT(4%,30,720000,0,0)=$41637.67
c.
Year | Opening Loan | Interest @ 4% | Installment | Principal Repayment | Closing |
1 | 720000 | 28800 | 41637.67 | 12837.67 | 707162.33 |
2 | 707162.33 | 28286.49 | 41637.67 | 13351.18 | 693811.15 |
3 | 693811.15 | 27752.45 | 41637.67 | 13885.23 | 679925.93 |
4 | 679925.93 | 27197.04 | 41637.67 | 14440.63 | 665485.29 |
5 | 665485.29 | 26619.41 | 41637.67 | 15018.26 | 650467.03 |
6 | 650467.03 | 26018.68 | 41637.67 | 15618.99 | 634848.04 |
7 | 634848.04 | 25393.92 | 41637.67 | 16243.75 | 618604.29 |
8 | 618604.29 | 24744.17 | 41637.67 | 16893.50 | 601710.79 |
9 | 601710.79 | 24068.43 | 41637.67 | 17569.24 | 584141.55 |
10 | 584141.55 | 23365.66 | 41637.67 | 18272.01 | 565869.54 |
11 | 565869.54 | 22634.78 | 41637.67 | 19002.89 | 546866.65 |
12 | 546866.65 | 21874.67 | 41637.67 | 19763.01 | 527103.65 |
13 | 527103.65 | 21084.15 | 41637.67 | 20553.53 | 506550.12 |
14 | 506550.12 | 20262 | 41637.67 | 21375.67 | 485174.46 |
15 | 485174.46 | 19406.98 | 41637.67 | 22230.69 | 462943.76 |
16 | 462943.76 | 18517.75 | 41637.67 | 23119.92 | 439823.84 |
17 | 439823.84 | 17592.95 | 41637.67 | 24044.72 | 415779.12 |
18 | 415779.12 | 16631.16 | 41637.67 | 25006.51 | 390772.62 |
19 | 390772.62 | 15630.9 | 41637.67 | 26006.77 | 364765.85 |
20 | 364765.85 | 14590.63 | 41637.67 | 27047.04 | 337718.81 |
21 | 337718.81 | 13508.75 | 41637.67 | 28128.92 | 309589.89 |
22 | 309589.89 | 12383.6 | 41637.67 | 29254.08 | 280335.82 |
23 | 280335.82 | 11213.43 | 41637.67 | 30424.24 | 249911.58 |
24 | 249911.58 | 9996.463 | 41637.67 | 31641.21 | 218270.37 |
25 | 218270.37 | 8730.815 | 41637.67 | 32906.86 | 185363.52 |
26 | 185363.52 | 7414.541 | 41637.67 | 34223.13 | 151140.38 |
27 | 151140.38 | 6045.615 | 41637.67 | 35592.06 | 115548.33 |
28 | 115548.33 | 4621.933 | 41637.67 | 37015.74 | 78532.59 |
29 | 78532.59 | 3141.304 | 41637.67 | 38496.37 | 40036.22 |
30 | 40036.22 | 1601.449 | 41637.67 | 40036.22 | 0.00 |
d. If Billy takes out a 20-year, $720,000 mortgage at 3.5%, his mortgage payments will be,
=PMT(3.5%,20,720000,0,0) = $50659.98
Year | Opening Loan | Interest @ 3.5% | Installment | Principal Repayment | Closing |
1 | 720000 | 25200 | 50659.98 | 25459.98 | 694540.02 |
2 | 694540.02 | 24308.9 | 50659.98 | 26351.07 | 668188.95 |
3 | 668188.95 | 23386.61 | 50659.98 | 27273.36 | 640915.59 |
4 | 640915.59 | 22432.05 | 50659.98 | 28227.93 | 612687.66 |
5 | 612687.66 | 21444.07 | 50659.98 | 29215.91 | 583471.75 |
6 | 583471.75 | 20421.51 | 50659.98 | 30238.46 | 553233.29 |
7 | 553233.29 | 19363.17 | 50659.98 | 31296.81 | 521936.48 |
8 | 521936.48 | 18267.78 | 50659.98 | 32392.20 | 489544.28 |
9 | 489544.28 | 17134.05 | 50659.98 | 33525.93 | 456018.35 |
10 | 456018.35 | 15960.64 | 50659.98 | 34699.33 | 421319.02 |
11 | 421319.02 | 14746.17 | 50659.98 | 35913.81 | 385405.21 |
12 | 385405.21 | 13489.18 | 50659.98 | 37170.79 | 348234.42 |
13 | 348234.42 | 12188.2 | 50659.98 | 38471.77 | 309762.65 |
14 | 309762.65 | 10841.69 | 50659.98 | 39818.28 | 269944.36 |
15 | 269944.36 | 9448.053 | 50659.98 | 41211.92 | 228732.44 |
16 | 228732.44 | 8005.635 | 50659.98 | 42654.34 | 186078.10 |
17 | 186078.10 | 6512.734 | 50659.98 | 44147.24 | 141930.86 |
18 | 141930.86 | 4967.58 | 50659.98 | 45692.40 | 96238.47 |
19 | 96238.47 | 3368.346 | 50659.98 | 47291.63 | 48946.84 |
20 | 48946.84 | 1713.139 | 50659.98 | 48946.84 | 0.00 |
e. Billy will save $235930.64, if he took out a 20-year mortgage versus a 30-year mortgage.
Total Interest @ 4% | $5,29,130.14 |
Total Interest @ 3.5% | $2,93,199.51 |
Total Savings | $2,35,930.64 |
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