Question

In: Statistics and Probability

Your employer is going to invest $75 per month in a 401k for you and promised...

Your employer is going to invest $75 per month in a 401k for you and promised to average a 5% return over the next 20 years. What would I type into Excel to estimate how much money should be in the 401k after 20 years?

Solutions

Expert Solution

We first compute the equivalent number of months for 20 years here as: 20*12 = 240 months.

Therefore we need to compute the Future value of 240 installments here as:

After this we simply extend the formula for all the rows here and get the FV of each of the installment to get here:

Month Installment Future Value
1 75 198.997328
2 75 198.189878
3 75 197.385704
4 75 196.584793
5 75 195.787132
6 75 194.992708
7 75 194.201507
8 75 193.413516
9 75 192.628723
10 75 191.847114
11 75 191.068677
12 75 190.293398
13 75 189.521265
14 75 188.752265
15 75 187.986385
16 75 187.223613
17 75 186.463935
18 75 185.707341
19 75 184.953816
20 75 184.203349
21 75 183.455927
22 75 182.711537
23 75 181.970168
24 75 181.231807
25 75 180.496443
26 75 179.764061
27 75 179.034652
28 75 178.308202
29 75 177.5847
30 75 176.864134
31 75 176.146491
32 75 175.431761
33 75 174.71993
34 75 174.010988
35 75 173.304922
36 75 172.601721
37 75 171.901374
38 75 171.203868
39 75 170.509193
40 75 169.817336
41 75 169.128286
42 75 168.442032
43 75 167.758563
44 75 167.077867
45 75 166.399933
46 75 165.72475
47 75 165.052307
48 75 164.382592
49 75 163.715594
50 75 163.051303
51 75 162.389707
52 75 161.730796
53 75 161.074558
54 75 160.420983
55 75 159.77006
56 75 159.121778
57 75 158.476127
58 75 157.833096
59 75 157.192673
60 75 156.554849
61 75 155.919613
62 75 155.286955
63 75 154.656864
64 75 154.029329
65 75 153.404341
66 75 152.781889
67 75 152.161962
68 75 151.544551
69 75 150.929645
70 75 150.317234
71 75 149.707308
72 75 149.099856
73 75 148.49487
74 75 147.892338
75 75 147.292251
76 75 146.694599
77 75 146.099373
78 75 145.506561
79 75 144.916154
80 75 144.328144
81 75 143.742519
82 75 143.15927
83 75 142.578388
84 75 141.999863
85 75 141.423686
86 75 140.849846
87 75 140.278335
88 75 139.709142
89 75 139.14226
90 75 138.577677
91 75 138.015385
92 75 137.455375
93 75 136.897637
94 75 136.342162
95 75 135.788941
96 75 135.237965
97 75 134.689224
98 75 134.14271
99 75 133.598414
100 75 133.056326
101 75 132.516438
102 75 131.97874
103 75 131.443224
104 75 130.909881
105 75 130.378702
106 75 129.849678
107 75 129.322801
108 75 128.798062
109 75 128.275452
110 75 127.754962
111 75 127.236585
112 75 126.720311
113 75 126.206131
114 75 125.694038
115 75 125.184023
116 75 124.676077
117 75 124.170192
118 75 123.66636
119 75 123.164573
120 75 122.664821
121 75 122.167097
122 75 121.671393
123 75 121.1777
124 75 120.68601
125 75 120.196315
126 75 119.708608
127 75 119.222879
128 75 118.739121
129 75 118.257326
130 75 117.777486
131 75 117.299593
132 75 116.823639
133 75 116.349616
134 75 115.877517
135 75 115.407333
136 75 114.939057
137 75 114.472681
138 75 114.008198
139 75 113.545599
140 75 113.084877
141 75 112.626025
142 75 112.169034
143 75 111.713898
144 75 111.260609
145 75 110.809158
146 75 110.35954
147 75 109.911746
148 75 109.465769
149 75 109.021601
150 75 108.579236
151 75 108.138666
152 75 107.699883
153 75 107.262881
154 75 106.827652
155 75 106.394189
156 75 105.962484
157 75 105.532532
158 75 105.104324
159 75 104.677853
160 75 104.253113
161 75 103.830096
162 75 103.408796
163 75 102.989205
164 75 102.571317
165 75 102.155125
166 75 101.740621
167 75 101.327799
168 75 100.916652
169 75 100.507173
170 75 100.099356
171 75 99.6931935
172 75 99.2886791
173 75 98.8858061
174 75 98.4845678
175 75 98.0849575
176 75 97.6869687
177 75 97.2905948
178 75 96.8958292
179 75 96.5026654
180 75 96.1110969
181 75 95.7211172
182 75 95.3327199
183 75 94.9458985
184 75 94.5606468
185 75 94.1769582
186 75 93.7948264
187 75 93.4142452
188 75 93.0352083
189 75 92.6577093
190 75 92.2817421
191 75 91.9073004
192 75 91.534378
193 75 91.1629688
194 75 90.7930666
195 75 90.4246653
196 75 90.0577588
197 75 89.6923411
198 75 89.3284061
199 75 88.9659479
200 75 88.6049603
201 75 88.2454374
202 75 87.8873734
203 75 87.5307622
204 75 87.1755981
205 75 86.821875
206 75 86.4695872
207 75 86.1187288
208 75 85.7692941
209 75 85.4212773
210 75 85.0746725
211 75 84.7294741
212 75 84.3856765
213 75 84.0432738
214 75 83.7022604
215 75 83.3626307
216 75 83.0243791
217 75 82.6875
218 75 82.3519878
219 75 82.017837
220 75 81.685042
221 75 81.3535974
222 75 81.0234976
223 75 80.6947373
224 75 80.3673109
225 75 80.0412131
226 75 79.7164385
227 75 79.3929816
228 75 79.0708372
229 75 78.75
230 75 78.4304646
231 75 78.1122257
232 75 77.7952781
233 75 77.4796166
234 75 77.1652358
235 75 76.8521307
236 75 76.5402961
237 75 76.2297268
238 75 75.9204176
239 75 75.6123635
240 75 75.3055593

The future value finally is computed by adding the last column here to get:

FV =

30559.3337

Therefore at the end of 20 years, the account would have: $30,559


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