The "Rule of 72" gives a good approximation of 72/4=18%.
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Use the "rule of 72"...simply put, using compound interest you take the number 72 and divide it by the interest rate. Thus, at 5% the time to double is 14.4 years. This formula can be used for calculating a "double" for any interest rate using the same mathematical procedure.
Nine years at 8%
10 years
14.87% per annum, compounded for 5 years would give back very slightly more than double (2.000014).
It is interest