$\displaystyle ln(\frac{[A]_{\circ}}{[A]_{t}})=kt$

$\displaystyle ln(\frac{[A]\circ}{\frac{1}{4}[A]_{\circ}})=kt_\frac{1}{4}$

$\displaystyle ln(4)=kt_{\frac{1}{4}}$

do I set t=1/4 ?

$\displaystyle \frac{ln(4)*4}{k}$

$\displaystyle \frac{5.545}{k}$

What am I doing wrong here? The answer is allegedly 1.386/k

However, this answer key has been wrong before. Can someone please confirm/deny this?

Thank you