Hi, need help can anyone help me with this question ?

ali (Student CA CPT ) (118 Points)

21 March 2014  
i have a doubt about joint life policy  and i have attached images of that question.
my doubt is first wats the difference between the point A and point B of illustration 35.
and in point A y are v deducting 1400 and 700 from 18000 and distributing only 15900 to all partners??


and from point B y r v deducting 1800 from 18000 and distributing 16200 among all partners???


pls download the attachment for the question :) thanks