A textbook library has been established for helping needy students. They can borrow a few selected textbooks for the major part of the academic session after depositing an additional security equal to the price of the books to be borrowed. If a student wishes to retain textbooks after the issue of the Roll Number for examination, they will have to deposit an amount equal to five times the current price of books as additional security. This security will be refunded immediately after the books are returned. Since the number of such selected textbooks is limited, it may not be possible to satisfy the requirement of all deserving students.