If x books cost Tk. 5 each and y books cost Tk. 8 each, then the average cost, in taka per book is equal to

If x books cost Tk. 5 each and y books cost Tk. 8 each, then the average cost, in taka per book is equal to

A (5x+8y)/(x+y)

B (5x+8y)/xy

C (5x+8y)/13

D 40xy/(x+y)

Solution

Correct Answer: Option A

average cost = 5x X 8y /x+y