If the cost of a book is Rs. 25.75, find the cost of 24 such books.

If the cost of a pen is rs. 32.50, find the cost of 24 such pens.

6 note- books cost Rs. 156, find the cost of 54 such note-books.

The cost of 12 books is Rs. 144. Find the cost of 18 books.

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

14 books cost Rs 133, then find the cost of 20 books.

If the cost of 12 books is Rs 144, then the cost of 18 books is (a) Rs 206 (b) Rs 216 (c) Rs 198 (d) Rs 180