Proof of Debts Rules

On any debt or sum certain, payable at a certain time or otherwise, whereon
            interest is not reserved or agreed and which is overdue at the date of the bankruptcy
            order and provable in bankruptcy, the creditor may prove for interest at the rate
            determined under
section 49(1
)(
b)
of the High Court Ordinance (
Cap. 4
) that is in effect on the date of the bankruptcy order
            to the date of the order from the time when the debt or sum was payable, if the debt or
            sum is payable by virtue of a written instrument at a certain time, and if payable
            otherwise, then from the time when a demand in writing has been made giving the debtor
            notice that interest will be claimed from the date of the demand until the time of
            payment.