What percent of the average sales of branches B1, B2 and B3 in 2001 is the average sales of branches B1, B3 and B6 in 2000?

Average sales (in thousand number) of branches B1, B3 and B6 in 2000

=	1	x (80 + 95 + 70)	=		245		.
	3				3

Average sales (in thousand number) of branches B1, B2 and B3 in 2001

=	1	x (105 + 65 + 110)	=		280		.
	3				3

Required percentage =		245/3	x 100		% =		245	x 100		% = 87.5%.
		280/3					280