Q$4)$ Given the following average demand for each month, calculate:

a$)$ Seasonal indices for each month. $(3\mathrm{.}5$ Marks$)$

b$)$ Calculate expected monthly demand if the annual forecast is $2000$ units. $(3\mathrm{.}5$ Marks$)$

$\backslash$table$[[$Month$,$Average Demand,Seasonal Index$],[$January$,30,],[$February$,50,],[$March$,85,],[$April$,110,],[$May$,125,],[$June$,245,],[$July$,255,],[$August$,135,],[$September$,100,],[$October$,90,],[$November$,50,],[$December$,30,],[$Total$,,]]$