Find $I_1$ and $V_o$ in the circuit shown given that $V_1 = 8 V$, $R_1 = 12 k\Omega$, $R_2 = 4 k\Omega$, $R_3 = 16 k\Omega$, and $R_4 = 20 k\Omega$.

The total resistance seen by the voltage source = $k\Omega$
The total current supplied by the voltage source = $I_{all} =$ $mA$
$I_1 =$ $mA$
The current through $R_3$ and $R_4$ is $I_{34} =$ $mA$
$V_o =$ $V$