Find $I_s$ and $I_o$ of the circuit shown given that $V_s = 11 V$, $R_1 = 14 \Omega$, $R_2 = 7 \Omega$, $R_3 = 17 \Omega$, $R_4 = 20 \Omega$ and $R_5 = 12 \Omega$.

$I_s=$ $A$
$I_o=$ $A$