Study the following graph to answer these questions.
The following bar graph shows the revenue generated by three realty firms A, B and C during 2012 to 2016. Each of these firms builds Low Income Group (LIG) apartments, Middle Income Group (MIG) apartments and High Income Group (HIG) apartments.
If the profit earned by A in 2015 is $$\frac{1}{6}th$$ of the average of the revenues of A in 2015, B in 2013 and C in 2012, the investment of A in 2015 is ..........