Firstly, prices in delhi at any given day are cheaper than mumbai, I have qouted price as per Mumbai - Lamington Road.
Secondly, This combo was bought in MARCH2011 & not March 1947, so prices are still at par, as I had bought this for 20,600 & Todays Lamington Roads price is 20,000 for this Combo.
Hence a depreciation of 5600 rupees for less than 3 months of a product use is not confusing as far as I understand and I believe most of us here would too, hence would request you to also come out of that confused state.