If 4 books cost 36 rupees than what is the cost of 8 books?
Cost of 1 book = 36/4 = Rs.9
Cost of 8 books = 9 x 8 = Rs.72
OR
We know that 8 is twice of 4.
Hence, the cost of 8 books will also be twice the cost of 4 books.
So,
Cost of 8 books = 36 x 2 = Rs.72
Cost of 8 books = 9 x 8 = Rs.72
OR
We know that 8 is twice of 4.
Hence, the cost of 8 books will also be twice the cost of 4 books.
So,
Cost of 8 books = 36 x 2 = Rs.72