By what per cent were the total exports of computers, by the company, in 2013, 2014 and 2018 less than the total production of computers in 2015 to 2017? (correct to one decimal place)

The total production of computers in 2013, 2015 and 2018 is $x \%$ of the total exports of computers by the company during the 6 yr .

The value of $x$ is

Following bar graph shows the sales of books (in thousand number) from Five branches of a publishing company during two consecutive years 2010 and 2011.

What is the ratio of total sale of branch $B_2$ for both year to the total sale of branch $B_4$ for both year?

Following bar graph shows the sales of books (in thousand number) from Five branches of a publishing company during two consecutive years 2010 and 2011.

What is the average sales of all the branches (in thousand numbers) for the year of 2010?