70=2.5(1.07)^t t=49.25 How do I find this? How do I solve for t in a situation like this?
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Originally Posted by Dave J 70=2.5(1.07)^t t=49.25 How do I find this? How do I solve for t in a situation like this? Divide both sides by 2.5, $\displaystyle (1.07)^t=70/2.5=28$ Take logarithm of both sides, $\displaystyle \log 1.07^t = \log 28$ $\displaystyle t\log 1.07=\log 28$ $\displaystyle t=\frac{\log 28}{\log 1.07}\approx 77.25$
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