Determine the time it takes to double an investment in an account that pays interest of 4% per annum compounded quaterly..... so far i am thinking 2A=A (1+ 0.00013) ^ 4x, but it doesnt work
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How did you get 0.00013? If it's compounded quarterly then you need to divide your 4% annual rate by the number of compounds (4). $\displaystyle 2A = A\left(1+\dfrac{0.04}{4}\right)^{4t}$
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