73.
Study the given bar-graph and answer the question that follows.
The bar-graph shows the production (in lakh) of kitchen appliances manufactured by three companies A, B, and Cover a period of six years from 2012 to 2017.
What is the difference (in lakh) between the average production of company B during the period 2012 to 2017 and the combined average of the production of company A in 2012, 2014, 2015 and the production of company C in 2014, 2016 and 2017, respectively?