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A dry fruit seller purchased 3 kinds of nuts at the rate of Rs. $100$/kg, Rs. $80$/kg and Rs. $60$/kg. He then mixed them, respectively, in the ratio $3:4:5$ by weight and sold the same to a customer at $50$% profit. The price at which he sold to the customer is

1. Rs. $110$
2. Rs. $90$
3. Rs. $70$
4. None of these

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