The line graph shows the production (in tonnes) and the sales (in tonnes) of a company.
What is the ratio of the productivity of the company in 2015 and 2016 taken together to the sales in 2017 and 2019 taken together?
1
307 ∶ 330
2
307 ∶ 229
3
307 ∶ 254
4
195 ∶ 214