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

Answer: Option D

Total sales (in thousand numbers) of branches B1, B3 and B6 in 2000
= 80 + 95 + 70
= 245
Average sales (in thousands number) of branches B1, B3 and B6 in 2000
= $$\frac{245}{3}$$
Total sales (in thousands number) of branches B1, B2 and B3 in 2001
= 105 + 65 + 110
= 280
Average sales (in thousand number) of branches B1, B2 and B3 in 2001
$$\begin{array}{rl}& =\frac{280}{3}\\ & \text{So,Required percentage}\\ & =\frac{\frac{245}{3}}{\frac{280}{3}}\times 100\%\\ & =\frac{245}{280}\times 100\\ & =87.5\%\end{array}$$