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The amount of tax, interest, penalty, fine or any other sum Roundingoffoftaxetc. payable, and the amount of refund or any other sum due, under the provisions .ofthis J\ct sll.all be rounded off to the nearest rupee and, for this purpose, where such amount contains a part of a rupee consisting of paise, then, if such part is fifty paise or more, it shall be increased to one rupee andif such · part is less than fifty paise it shall be ignored.