120 copies of a book cost Rs 540. what will 400 copies of this book cost?

The cost of 5 books is Rs. 40. What is the cost of 7 books?

A publisher printed 2000 copies of a book at a cost of Rs 70,000. He distributes 400 copies free as specimen copies . He gave 30% discount on printed price and the printed price of each book is Rs 75. What is his gain or loss percentage?

A publisher prints 2000 copies of a book for Rs 2400. He distributed 500 copies free. If he gives 25% discount and announces that he will give one book free on selling of 24 books. In this manner he sold all the books and M.P. of each book is 3.25 Rs than find his profit or loss?

If 6 note boks cost Rs. 45, how much would 8 note books cost?

If the cost of 15 books is Rs90, then what is the cost of one book?