(10)For the purposes of this section,—(a)interest payable under section 423, for the purposes of sub-section (1), shall be computed on the amount of tax on the total income as declared in the return under section 263(6), as per section 266(4);(b)interest payable under section 425, for the purposes of sub-section (3), shall be computed after taking into account the total income furnished in the return under section 263(6) as the returned income;(c)interest payable, for the purposes of sub-section (5), shall be the interest chargeable under any provision of this Act, on the income as per return furnished under section 263(6), as reduced by interest paid, as per the earlier return, if any.