$5.$ Per$-$unit: A $\backslash (100\backslash$mathrm$\{$MVA$\},13\mathrm{.}2\backslash$mathrm$\{$kV$\}3\backslash )$ phase power system network is shown in the figure below:

Calculate:

a$)$ Write down all the base values.

b$)$ Calculate the per$-$unit values of the voltage sources.

c$)$ Draw the one$-$line diagram $($Per phase$)$ with everything written in per unit.

d$)$ Find the currents at the arrows shows, in per$-$unit and in Amperes.