Study the given bar chart and answer the question that follows. The bar chart shows the production of medicines by a company (in 1000 tonnes) over six years 2010 to 2015.

If in each of the following years, the percentage increase in production as compared to the previous year is taken, then the ratio for increase production of the year 2011 to increase production of year 2015 is:

3 : 2

Percentage increase in production in 2011 = \(\frac{60 - 40 }{40}\) × 100

= \(\frac{1 }{2}\) × 100

Percentage increase in production in 2015 = \(\frac{80 - 60 }{60}\) × 100

= \(\frac{1 }{3}\) × 100

Required ratio ,  \(\frac{1 }{2}\)  :  \(\frac{1 }{3}\) 

= 3 : 2