Using Kirchhoff's rules, find the following. $,$ and ${}_3=78\mathrm{.}8V.)$

$($a$)$ the current in each resistor shown in the figure above $($Enter the magnitude.$)$

$I_{R_1}=,mA$

$I_{R_2}=,mA$

$I_{R_3}=,mA$

$($b$)$ the potential difference between points $c$ and $f$

magnitude of potential difference

$v$

point at higher potential

Answer the question please.