Answer
The current at point $a$ is $~~3.00~A$
Work Step by Step
The equivalent resistance of $R_1$ and $R_1$ in series is $2R_1$ which is $40.0~\Omega$
We can find the current in the circuit:
$i = \frac{120~V}{40.0~\Omega} = 3.00~A$
The current at point $a$ is $~~3.00~A$
