298 A MANUAL FOR NORTHERN WOODSMEN 
COMPOUND INTEREST TABLE 
Amount of $1 principal after any number of years and at 
given rates percent 
Yrs. 
2% 
2i% 
3% 
3*% 
4% 
4*% 
5% 
5i% 
6% 
1 
1.020 
1.025 
1.030 
1.035 
1.040 
1.045 
1.050 
1.055 
1.060 
2 
1.040 
1.051 
1.061 
1.071 
1.082 
1.092 
1.103 
1.113 
1.124 
3 
1.061 
1.077 
1.093 
1.109 
1.125 
1.141 
1.158 
1.174 
1.191 
4 
1.082 
1.104 
1.126 
1.148 
1.170 
1.193 
1.216 
1.239 
1.262 
5 
1.104 
1.131 
1.159 
1.188 
1.217 
1.246 
1.276 
1.307 
1.338 
6 
1.126 
1.160 
1.194 
1.229 
1.265 
1.302 
1.340 
1.379 
1.419 
7 
1.149 
1.189 
1.230 
1.272 
1.316 
1.361 
1.407 
1.455 
1.504 
8 
1.172 
1.218 
1.267 
1.317 
1.369 
1.422 
1.478 
1.535 
1.594 
9 
1.195 
1.249 
1.305 
1.363 
1.423 
1.486 
1.551 
1.619 
1.690 
10 
1.219 
1.280 
1.344 
1.411 
1.480 
1.553 
1.629 
1.708 
1.791 
11 
1.243 
1.312 
1.384 
1.460 
1.540 
1.623 
1 710 
1.802 
1.898 
12 
1.268 
1.345 
1.426 
1.511 
1.601 
1.696 
1.796 
1.901 
2.012 
13 
1.294 
1.379 
1.469 
1.564 
1.665 
1.772 
1.886 
2.006 
2.133 
14 
1.320 
1.413 
1.513 
1.619 
1.732 
1.852 
1.980 
2.116 
2.261 
15 
1.346 
1.448 
1.558 
1.675 
1.801 
1.935 
2.079 
2.233 
2.397 
16 
1.373 
1.485 
1.605 
1.734 
1.873 
2.022 
2.183 
2.355 
2.540 
17 
1.400 
1.522 
1.653 
1.795 
1.948 
2.113 
2.292 
2.485 
2.693 
18 
1.428 
1.560 
1.702 
1.853 
2.026 
2.209 
2.407 
2.622 
2.854 
19 
1.457 
1.599 
1.754 
1.923 
2.107 
2.308 
2.527 
2.766 
3.026 
20 
1.486 
1.639 
1.806 
1.990 
2.191 
2.412 
2.653 
2.918 
3.207 
25 
1.641 
1.854 
2.094 
2.363 
2.666 
3.005 
3.386 
3.813 
4.292 
30 
1.811 
2.098 
2.427 
2.807 
3.243 
3.745 
4.322 
4.984 
5.744 
35 
2.000 
2.373 
2.814 
3.334 
3.946 
4.667 
5.516 
6.514 
7.686 
40 
2.208 
2.685 
3.262 
3.959 
4.801 
5.816 
7.040 
8.513 
10.286 
45 
2.438 
3.038 
3.782 
4.702 
5.841 
7.248 
8.985 
11.127 
13.765 
50 
2.692 
3.437 
4.384 
5.585 
7.107 
9.033 
11.467 
14.542 
18.420 
TIME IN WHICH A SUM WILL DOUBLE 
Rate 
Per cent 
Simple Interest 
Compound Interest 
2 
50 years 
35 years 
2* 
40 years 
28 years 1 month 
3 
33 years 4 months 
23 years 5£ months 
3* 
28 years 7 months 
20 years 2% months 
4 
25 years 
17 years 8 months 
41 
22 years 2\ months 
15 years 9 months 
5 
20 years 
14 years 2} months 
5} 
18 years 7 months 
12 years 11£ months 
6 
16 years 8 months 
11 years 11^ months 
Note in above tables that a sum at compound interest doubles when rate 
of interest X number of years equals (very nearly) 71. With this remem¬ 
bered many problems in compound interest can be solved mentally. 
