Column A	Column B	Column C	Column D
Parent-1	600		 460		140		30.43%
Child-1		100		 85		15		17.65%
Child-2		200		 150		50		33.33%
Child-3		300		 225		75		33.33%
	
Value currently displayed in Column D is 84.31%	, 
which is the sum of 17.65% + 33.33% +33.33% = 84.31%)