RAJ

This is a 4 by 4 grid. So the number of squares is $4\times4 + 3\times3 + 2\times2 + 1\times1 = 30$ (excluding the 2 squares in the middle)

Now look at the two big squares in the centre.

Therefore, number of squares in the first square is $2\times2 + 1\times1 = 5$

There are two such squares.

Hence, total squares are $5\times2 = 10$

So total number of squares in this figure should be $30 + 10 = 40.$

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simple formula to apply is (n n+1 *2n+1) /6 for n n sides of a square then the 2 squares in the n*n sides square can be added hence answer is 40\