Ketaki prepares and supplies coconut-jaggery laddus. The price of a coconut is \(₹\)36 and the price of \(1 kg\) jaggery is \(₹\)52.
1. How much should she pay if she buys 7 coconuts and 10 \(kg\) jaggery? \(₹\)
2. How much should she pay if she buys 14 coconuts and 5 \(kg\) jaggery? \(₹\)
3. Write an algebraic expression to find the total amount to be paid for a given number of coconuts and quantity of jaggery.
4. Use this expression (or formula) to find the total amount to be paid for \(7\) coconuts and \(4\) \(kg\) jaggery: \(₹\)