Q. Padam purchased 30 kg of rice at the rate of Rs. 17.50 per kg and another 30 kg. rice at a certain rate. He mixed the two and sold the entire quantity at the rate of Rs.18.60 per kg and made 20% overall profit. At what price per kg did he purchase the lot of another 30 kg rice?

1. Rs 12.50
2. Rs 13.50
3. Rs 14.50
4. Rs 15.50