For which model the percentage rise/fall in production from 2000 to 2001 was minimum?

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?

The total production of flavour Z in 1997 and 1998 is what percentage of the total production of flavour X in 1995 and 1996?