# If 4 books cost 36 rupees than what is the cost of 8 books?

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

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