Consider the location of a warehouse to distribute books for the cities of Bombay. Bangalore and Calcutta. The estimated volume of distribution to Bombay. Bangalore and Calcutta are 55,000, 20,000 and 25,000 units respectively. Using some appropriate origin the (x, y) co – ordinates of Bombay. Bangalore and Calcutta can be approximated as (10, 20), (20, 10) and (30,30) respectively. The (x, y) co – ordinates of the optimal location would be
(a) (20, 20) (b) 10, 20) (c) (30, 20) (d) (20, 30)