whether the allottees are liable to pay interest ? = the Board entered into agreements of sale with various allottees of the plots of land during the years 1988-1990 and made a provision therein that the Board shall be entitled to re-fix the final price of the property agreed to be sold to the allottees taking into account inter alia the enhanced compensation awarded by the Courts and Tribunals and that the decision of the Board in fixing the revised price of the property shall be conclusive and final. It was also expressly agreed in the agreements of sale that after finalization of the price of the property agreed to be sold by the Board, the allottee shall pay to the Board together with interest at the rate of 15% per annum, the difference between the tentative price fixed and the price finally fixed for the property by the Board within thirty days of the date of a registered notice demanding the payment thereof or in such quarterly installments over a period not exceeding two years to « advocatemmmohan