Question 978603
23152=20000(1+r)^3
divide by 20000
1.1576=(1+r)^3

ln of both sides, remembering that ln of an exponent puts the exponent in front.
0.1463=3 ln (1+r)
divide by 3
0.04878=ln(1+r)

raise both to e power

1.0499=1+r
r=0.0499 or probably 5%.

Check:  20000(1.05^3)=23152

===================================
35816.95=20000(1+r)^10
Do the same way
1.79084=(1+r)^10.   Without rounding, take the ln of the left and then divide by 10, since the right will become 10 ln (1+r)

0.0583=ln(1+r)
now raise both to e power
1.05999=1+r
r=6%

20000(1.06)^10=35816.95