Study the following graph to answer these questions:
The percentage profits of four leading airliners A, B, C and D for six years 18 shown in the line graph below.
In 2016, investment made by’ ₹437 crore. B invests 20% more than A, C invests 20% than B and D invests 20% more than C. If the profit earned by each is the average profit per cent in 2016, who earns least revenue?