(a) $7x+4<\frac{1}{2}(4x+3)$
$7x+4<2x+\frac{3}{2}$
$7x-2x<\frac{3}{2}-4$
$5x<-\frac{5}{2}$
$\frac{5x}{5}<\frac{-\frac{5}{2}}{5}$
$x<-\frac{1}{2}$.
(b) When Salem gets N2 ------> Sunday gets 50 kobo
(Recall N1 = 100 kobo)
Salem gets 200 kobo ------> Sunday gets 50 kobo.
Sunday gets N4 -----> Shaka gets N2.
====> Sunday gets 400 kobo ------> Shaka gets 200 kobo.
When Sunday gets 400 kobo ------> Salem gets 1600 kobo.
$\therefore$ Salem : Sunday : Shaka = 1600 : 400 : 200
= 8 : 2 : 1
$\therefore \text{Shaka's share}=\frac{1}{11}\times N1,100=N100$