The given line graph shows the production (in tonnes) and the sales (in tonnes) of a company.

What is the difference (in tonnes) in the production in 2015 and 2017 taken together and the sales in 2018 and 2019 taken together?

434

Production of company in 2015 and 2017 = 600 + 750 = 1350

Sale of company in 2018 and 2019 = 400 + 516 = 916

Difference in production in 2015 and 2017 & sale  in 2018 and 2019 = 1350 - 916

= 434