31. Notwithstanding anything contained in any law for the time being in force, no Court shall, in any decree passed in any suit to which this Act applies-(a) if the loan to which the decree relates was advanced before the commencement of this Act, allow any interest on the decretal amount, or(b) if the loan to which the decree relates was advanced after the commencement of this Act, allow any interest other than interest not exceeding six per centum per annum on the principal sum adjudged.