Ramsukh bhai sells rasgulla (a favourite Indian sweets) at ₹15 per kg. A rasgulla is made up of flour and sugar in the ratio of 5 : 3. The ratio of price of sugar and flour is 7 : 3 (per kg ). Thus, he earns \(66{\frac{2}{3}}\)% profit. What is the cost price of sugar?
1
₹10/kg
2
₹9/kg
3
₹18/kg
4
₹14/kg