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The cost of Type 1 rice is Rs. 15 per kg and Type 2 rice is Rs.20 per kg. If both Type 1 and Type 2 are mixed in the ratio of 2 : 3, then the price per kg of the mixed variety of rice is ?

A)  Rs. 19.50
B)  Rs. 19
C)  Rs. 18
D)  Rs. 18.50