A shopkeeper mixes three varieties of rice priced at Rs. $50$ per kg, Rs. $60$ per kg, and Rs. $85$ per kg in the ratio $2 : 3 : 5$ by weight. What is the average price per kg of the resulting mixture?
Options:
- A: Rs. $70.50$
- B: Rs. $68.50$
- C: Rs. $72.00$
- D: Rs. $71.50$
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