$19.22 (rounded)
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If it's 12% per year, compounded annually, then it is: 100 * (1 + 0.12)-2 = 79.72
As a rough guide to double any amount compounded annually, divide 70 by the interest rate. In this case that is 14 years.
You will have 5000 dollars × (1 + 8/100)18 = 19,980 dollars.
332.01
Approx 44.225 % The exact value is 100*[3^(1/3) - 1] %