Btw on serious note, months ago OPEC and Russia had informally decided that $90 is a fair level for crude and were working towards it. China, US and Iran have only accelerated the process.
Also a few weeks back, Kaushik Basu also suggested that rupee depreciation is desirable and may be it is being done deliberately (non intervention), because rupee has been strengthening in real terms. 72-73 is where it will stabalise, as per him.