This was a difficult manipulation of numbers, and I received 4 answers from Mahi Saraf, Anand Singhi, Pratik Poddar and Prakhar Prakash. Only two of these I found to be completely correct – from Mahi Saraf and Anad Singhi. That said, I found the approach from all of them to be very good and similar. Well done Mahi and Anand!
Here is the answer from Mahi, and I am also reproducing the answer from the original source.