AMC 12 2016b Problem 1

What is the value of $\frac{2a^{-1}+\frac{a^{-1}}{2}}{a}$ when $a= \frac{1}{2}$?

\textbf{(A)}\ 1 \textbf{(B)}\ 2 \textbf{(C)}\ \frac{5}{2} \textbf{(D)}\ 10 \textbf{(E)}\ 20