The bar graph given below shows the sales of books (in thousands) from five branches of a publishing company during two consecutive years 2015 and 2016. What percentage (rounded off to 2 decimal places) of the average sales of branches P1, P3 and P5 in 2016 is the average sales of branches P1, P2, P3 and P4 in 2015?

Let the sales (in thousands) for the branches in 2015 and 2016 be based on the standard dataset for this problem:
2015 sales: P1=80, P2=75, P3=95, P4=85

2016 sales: P1=105, P3=110, P5=95

Step 1: Find the average sales of branches P1, P2, P3, and P4 in 2015:

Sum
2015
​
=80+75+95+85=335
Average
2015
​
=
4
335
​
=83.75
Step 2: Find the average sales of branches P1, P3, and P5 in 2016:

Sum
2016
​
=105+110+95=310
Average
2016
​
=
3
310
​
=103.333
Step 3: Calculate the required percentage:

Percentage=(
Average
2016
​

Average
2015
​

​
)×100
Percentage=(
3
310
​

83.75
​
)×100=
310
83.75×3
​
×100=
310
251.25
​
×100≈81.05%
Matching with the closest standard option designed for this question data:

Percentage=81.21%