By selling an item, the producer, the wholesaler and the retailer all make profits at 20%. If the item sells for Tk. 21.60 by the retailer, find the production cost of the item.
A
Tk. 15.00
B
Tk. 12.50
C
Tk. 12.75
D
Tk. 15.50
Correct Answer: Tk. 15.00