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OpenStudy (anonymous):
Thor invests $3000 in an account, with interest compounded continuously. If his investment doubles in value after 7.2 years, what interest rate is he earning? [Use the formla A = Pert and round answer to the nearest tenth.]
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OpenStudy (anonymous):
\[e^{r\times 7.2}=2\] \[7.2r=\ln(2)\] \[r=\frac{\ln(2)}{7.2}\] then a calculator
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