Posted by thomas on Monday, January 7, 2013 at 11:19am.
Assuming compound interest at 6.5% compounded annually
1000(1.065)^n = 18600
1.065^n = 18.6
log 1.065^n = log 18.6
n log 1.065 = log 18.6
n = log 18.6 / log 1.065 = appr 46.4 years
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