Question 910817
Let x = the percent increase every 3 months
1(1+x)^5 = 2 , The original amount 1 compounded at x percent for 5 periods of
3 months each
Plugging the above into a solver like www.wolframalpha.com
the result is x is approximately 0.148698
Testing 1.148698^5 we get 1.9999969... so we are pretty close.