The average income of 10 BBA graduates is Tk. x. The individual income of 5 MBA graduates is Tk. 100y each. What is the average income of these 15 graduates?

Correct Answer: (10x+500y)/15
Total income of BBA graduates = 10x Total income of MBA graduates = 5 x 100y = 500y Average income of all of the graduates = (10x + 500y) / (10 + 5)                                                                 = (10x + 500y) / 15