A merchant mixes two types of oil one costing Rs. 180 per kg and the other costing Rs. 220 in the ratio 3: 1. What is the approximate profit percent if he sells this at Rs. 210 per kg. 1. 9.8% 2. 11% 3. 7.6% 4. 10.5% None of these 5. A merchant mixes two types of oil one costing Rs. 180 per kg and the other costing Rs. 220 in the ratio 3: 1. What is the approximate profit percent if he sells this at Rs. 210 per kg. 1. 9.8% 2. 11% 3. 7.6% 4. 10.5% None of these 5. A merchant mixes two types of oil one costing Rs. 180 per kg and the other costing Rs. 220 in the ratio 3: 1. What is the approximate profit percent if he sells this at Rs. 210 per kg. 1. 9.8% 2. 11% 3. 7.6% 4. 10.5% None of these 5.