Question

A=P(1+r/n)^nt solve r

Answer 1

$A=P\left(1+\dfrac rn\right)^{nt}$
$\dfrac AP=\left(1+\dfrac rn\right)^{nt}$
$\ln\dfrac AP=nt\ln\left(1+\dfrac rn\right)$
$\dfrac{\ln\frac AP}{nt}=\ln\left(1+\dfrac rn\right)$
$e^{\ln(A/P)/(nt)}=1+\dfrac rn$
$e^{\ln(A/P)/(nt)}-1=\dfrac rn$
$n\left(e^{\ln(A/P)/(nt)}-1\right)=r$