Hello,

Let the income be x

So, from first and second condition, the total saving is,

x - ( 20% + 25% )of x = x - 0.45x = 0.55x

Now, Half of the remaining amount is spend and half is saved.

So, 0.275x is saved and 0.275x is spend.

So, now, as per last condition, 2,750/- is saved.

So, 0.275x = 2750

So, x = 10,000/-

Hence, his monthly income is 10,000/-

Best Wishes.