A man purchased 5 bags of rice at the rate of ₹900 each,7 bags of rice at ₹1,000 each and 8 bags of rice at the rate of ₹1,200 each. What is the average cost of 1 kg of rice if each bag contains 50 kg of rice?

A

₹25.5

B

₹19.1

C

₹21.1

D

₹20.5