Solution:
Amount invested = $8,860
Required amount after 18 years = $57,906
Let rate of return earned = i%
Now
P * (1+i)^n = $57,906
$8,860 (1+i)^18 = $57,906
(1+i)^18 = 6.5356659
1+i = (6.5356659)^1/18
i = 10.99%
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