Problem of 50 paisa

Recently, I've been forced to cultivate a hobby of collecting 50 paisa coins....all because of the shrewd autowallahs (especially those whose vehicles ply between Jadavpur 8B bus stand and Baghajatin) who always demand the exact fare of Rs. 2.50 and never give back the change if it's Rs. 3.00. If Rs. 5.00 is given, they would make you hear some sweet nothings (though these dialogs are quite somethings, at least to me) and then reluctantly give back the change. However, if your stars don't favor you, you may encounter someone who would drive the auto forward without giving anything back saying "Khuchro nei to othen keno?" (If you don't have change, why do you board the auto?)

25 paisa is already an extinct species and I feel awkward whenever I get a single coin of this denomination (coz if it comes in pair, my 50 paisa problem is solved). So, until the 50 paisa follows suit, my turmoil would continue.