Process X has fixed cost of Rs. 40,000 and variable cost of Rs. 9 per unit whereas process Y has fixed cost of Rs. 16,000 and variable cost of Rs. 24 per unit. At what production quantity, the total cost of X and Y are equal?
(a) 1200 units (b) 1600 units
(c) 2000 units (d) 2400 units