Question : A trader had 1200 kg. of rice. He sold a part of it at 5% profit and the rest at 11% profit, so that he made a total profit of 7%. How much (In kg) rice did he sell at 5% profit?

Question : A trader buys 20 kg of rice at Rs. 30 per kg and another 20 kg of a different variety of rice also at Rs. 30 per kg. He then mixes them and sells the mixture at Rs. 33 per kg. What is his percentage of profit?