Q. Gopal purchased 35 kg of rice at the rate of Rs 9.50 per kg and 30 kg at the rate of Rs 10.50 per kg. He mixed the two. Approximately, at what price per kg should he sell the mixture to make 35 % profit in the transaction?

1. Rs. 12
2. Rs. 13
3. Rs. 14
4. Rs. 13.50