Prabhu purchased 30 kg of rice at the rate of 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 18.60 per kg and made 20 per cent overall profit. At what price per kg did he purchase the lot of another 30 kg rice?	Options.
A) 14.5  B) 12.5  C) 15.5  D) 13.5  E) None of these
Let he purchase of x/kg.   ∴ (525 + 30x) × 120⁄100 = 60 × 18.60   ⇒ x = 13.5/kg.   Answer 13.5
<result>D</result>
Prabhu purchased 30 kg of rice at the rate of 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 18.60 per kg and made 20 per cent overall profit. At what price per kg did he purchase the lot of another 30 kg rice?