In: Accounting
Matthew has a new job as business analyst. He plans to invest 15 percent of his annual salary after the tax into a retirement account at the end of every year for the next 25 years. Suppose that annual return is 4, and his current salary before tax is 80k which grow 3% per year. The tax will apply as 15% on the salary up to 50k and it is 20% for the salary interval of 50k and 80k and the tax rate will be 25% for the remaining salary more than 80k (for example if his salary will be 105k, he is paying 15% tax on his first 50k and 20% in the next 25 k and 25% on his next 25k of his salary). then:
a)Create a spreadsheet which shows Matthew the balance of retirement account for various levels of annual investments and returns.
b)If the annual return rate is uncertain and it is between 5% to 9% in any given year (hint: use = =RANDBETWEEN(2,9)/100) what would be the expected value (average) of Matthew balance after 25 years (use the model 10 times then report the average) .
a)
End of Year | Salary(Prev Value*103%) | Tax(=(50000*15%)+(30000*20%)+((Salary-80000)*25%) | Net Salary(Salary-Tax) | Investment Installment (Net Salary*15%) | Balance in Investment Acct@4%{=(Prev Balance*104%)+Current Installment} |
1 | 80,000 | 13500 | 66,500 | 9975 | 9975 |
2 | 82400 | 14100 | 68,300 | 10245 | 20619 |
3 | 84872 | 14718 | 70,154 | 10523.1 | 31966.86 |
4 | 87418.16 | 15354.54 | 72,064 | 10809.543 | 44055.0774 |
5 | 90040.7048 | 16010.1762 | 74,031 | 11104.57929 | 56921.85979 |
6 | 92741.92594 | 16685.48149 | 76,056 | 11408.46667 | 70607.20085 |
7 | 95524.18372 | 17381.04593 | 78,143 | 11721.47067 | 85152.95955 |
8 | 98389.90923 | 18097.47731 | 80,292 | 12043.86479 | 100602.9427 |
9 | 101341.6065 | 18835.40163 | 82,506 | 12375.93073 | 117002.9912 |
10 | 104381.8547 | 19595.46368 | 84,786 | 12717.95865 | 134401.0695 |
11 | 107513.3103 | 20378.32759 | 87,135 | 13070.24741 | 152847.3597 |
12 | 110738.7097 | 21184.67741 | 89,554 | 13433.10484 | 172394.3589 |
13 | 114060.8709 | 22015.21774 | 92,046 | 13806.84798 | 193096.9812 |
14 | 117482.6971 | 22870.67427 | 94,612 | 14191.80342 | 215012.6639 |
15 | 121007.178 | 23751.7945 | 97,255 | 14588.30752 | 238201.478 |
16 | 124637.3933 | 24659.34833 | 99,978 | 14996.70675 | 262726.2438 |
17 | 128376.5151 | 25594.12878 | 102,782 | 15417.35795 | 288652.6515 |
18 | 132227.8106 | 26556.95265 | 105,671 | 15850.62869 | 316049.3863 |
19 | 136194.6449 | 27548.66122 | 108,646 | 16296.89755 | 344988.2593 |
20 | 140280.4842 | 28570.12106 | 111,710 | 16756.55448 | 375544.3441 |
21 | 144488.8988 | 29622.22469 | 114,867 | 17230.00111 | 407796.119 |
22 | 148823.5657 | 30705.89143 | 118,118 | 17717.65115 | 441825.6149 |
23 | 153288.2727 | 31822.06818 | 121,466 | 18219.93068 | 477718.5702 |
24 | 157886.9209 | 32971.73022 | 124,915 | 18737.2786 | 515564.5916 |
25 | 162623.5285 | 34155.88213 | 128,468 | 19270.14696 | 555457.3222 |
b)
Balance in Investment Acct@Random 5-9%{=(Prev Bal+ Prev Balance*Randbetween(5,9)%)+Current Installment} | Balance in Investment Acct@Random 5-9%{=(Prev Bal+Prev Balance*Randbetween(5,9)%)+Current Installment} | Balance in Investment Acct@Random 5-9%{=(Prev Bal+Prev Balance*Randbetween(5,9)%)+Current Installment} | Balance in Investment Acct@Random 5-9%{=(Prev Bal+Prev Balance*Randbetween(5,9)%)+Current Installment} | Balance in Investment Acct@Random 5-9%{=(Prev Bal+Prev Balance*Randbetween(5,9)%)+Current Installment} | Balance in Investment Acct@Random 5-9%{=(Prev Bal+Prev Balance*Randbetween(5,9)%)+Current Installment} | Balance in Investment Acct@Random 5-9%{=(Prev Bal+Prev Balance*Randbetween(5,9)%)+Current Installment} | Balance in Investment Acct@Random 5-9%{=(Prev Bal+Prev Balance*Randbetween(5,9)%)+Current Installment} | Balance in Investment Acct@Random 5-9%{=(Prev Bal+Prev Balance*Randbetween(5,9)%)+Current Installment} | Balance in Investment Acct@Random 5-9%{=(Prev Bal+Prev Balance*Randbetween(5,9)%)+Current Installment} | ||
9975 | 9975 | 9975 | 9975 | 9975 | 9975 | 9975 | 9975 | 9975 | 9975 | ||
21117.75 | 20718.75 | 20918.25 | 20818.5 | 20718.75 | 21018 | 20818.5 | 21018 | 20818.5 | 21018 | ||
33330.27 | 32484.98 | 32487.26 | 33215.27 | 32277.79 | 32592 | 32590.71 | 33432.72 | 33215.27 | 33222.54 | ||
46806.23 | 46218.17 | 44921.17 | 46349.88 | 44701.22 | 45357.06 | 46007.51 | 47251.21 | 46017.72 | 46689.89 | ||
61187.25 | 60558.02 | 59170.23 | 60698.95 | 59381.9 | 59636.64 | 61252.76 | 60718.35 | 59883.37 | 60128.96 | ||
75655.08 | 76205.54 | 73537.21 | 76356.34 | 74353.28 | 75219.67 | 75723.87 | 77591.47 | 74286 | 76949.03 | ||
94185.51 | 93261.4 | 91877.03 | 91895.63 | 91279.48 | 93710.91 | 91988.77 | 94744.34 | 90464.63 | 92517.96 | ||
111880.5 | 113698.8 | 111271.1 | 111291.1 | 109712.9 | 111377.4 | 109552 | 112472.9 | 110650.3 | 111038.1 | ||
129850.5 | 134033.6 | 130323.2 | 129231.6 | 129768.7 | 132663.6 | 131787.6 | 130472.4 | 129665.3 | 128965.9 | ||
149060.9 | 157474.3 | 153467.1 | 149703.5 | 148975.1 | 154668 | 155048.5 | 151018.7 | 151459.8 | 152001.1 | ||
175546.7 | 178418.3 | 180349.4 | 171755.9 | 173963.4 | 175471.6 | 180522.7 | 171639.9 | 175132.2 | 178751.5 | ||
197757.1 | 202556.5 | 208210.4 | 195494.4 | 196094.7 | 197678.3 | 202981.9 | 197087.8 | 204327.2 | 206484.7 | ||
223429.4 | 232567.8 | 236592 | 221030.9 | 223628.1 | 225322.6 | 230997.5 | 224690.8 | 232437 | 238875.2 | ||
253261.2 | 263039.4 | 267345.2 | 248484.6 | 257946.5 | 259793.5 | 265979.1 | 254611 | 262899.4 | 274565.8 | ||
290643.1 | 301301.2 | 305994.6 | 275497.1 | 288011.6 | 287371.4 | 296526.1 | 292114.3 | 290632.7 | 308373.7 | ||
325984.8 | 337389 | 342410.9 | 304268.7 | 328929.3 | 319610.4 | 329314.4 | 327559 | 323067.3 | 351124 | ||
357701.4 | 376423.6 | 388645.3 | 337942.2 | 367371.7 | 363792.7 | 364490.6 | 369181.1 | 354638 | 398142.5 | ||
391437.1 | 414859.6 | 423928.2 | 370689.9 | 401590.9 | 397833 | 398565.8 | 418258 | 388220.6 | 445844.6 | ||
442963.3 | 456048.1 | 465660.7 | 412935.1 | 437967.4 | 441978.2 | 446747.9 | 455467.8 | 431692.9 | 484433.7 | ||
499586.6 | 500167.6 | 515013.6 | 462726.4 | 476622.3 | 494093 | 499244.3 | 513216.4 | 478668 | 539944.9 | ||
551787.6 | 562412.6 | 578594.8 | 512347.3 | 527215.9 | 550850.5 | 561406.3 | 571503.8 | 529404.7 | 584172.2 | ||
602612.5 | 608250.9 | 625242.2 | 555682.3 | 592383 | 596110.6 | 618422.4 | 629226.7 | 573592.6 | 636940.2 | ||
669041.5 | 681213.4 | 687229 | 607243.2 | 652069.7 | 667980.5 | 679931.9 | 678907.9 | 626228.1 | 687007.1 | ||
734611.7 | 761259.9 | 767816.9 | 680632.3 | 709931.2 | 746836 | 746264.4 | 758746.9 | 695063.6 | 767575 | Total | Avg(Total/10) |
819996.9 | 818593.1 | 848512.4 | 747546.8 | 793095.1 | 810916.3 | 817773.1 | 846304.3 | 749087 | 855926.9 | 8,107,752 | 810,775.2 |
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