4. Obtain the required inequation

Mr. Varun, the head librarian, can spend at most \(₹\)1000 to expand the economic book section in the library. When he buys from a seller, paperback books cost \(₹\)18 each and hardback books cost \(₹\)10 each.

 

If \(x\) denotes the number of paperback books, and \(y\) denotes the hardbound books, select the correct inequation that explains this situation.