HIKE HASSLE: Developers, particularly in Navi Mumbai and beyond have, reportedly, been asking for huge sums of black money as a result of which the end user is finding it difficult to buy a house. As opposed to the earlier 20 per cent to 30 per cent, developers have begun asking for nearly 40 per cnt to 50 per cent of the total cost of the flat in cash and black in order to save on income tax.