Board to give notice to persons liable to payment of betterment fees

When the amount of all betterment fees payable in respect of land in the area comprised in the scheme and in respect of land not comprised in the scheme area but is adjacent to the area comprised in the scheme referred to in sub-section (3) of section 63 has been assessed under section 64, the Board shall, by a notice in writing to be served on all persons liable to such payment, fix a date by which such payment shall be made, and interest at the rate of four and a half per cent per annum upon any amount outstanding shall be payable from that date: Provided that any person liable as aforesaid may make payment, if he so chooses, in such number of annual instalments not exceeding ten as the Board may determine.