27. (1) The National Board of Revenue may, subject to the control of the Government, make rules for carrying out the purposes of this Act. (2) Without prejudice to the generality of the foregoing power, such rules may-(a) prescribe the procedure to be followed on appeals, applications for rectification of mistakes, and applications for refunds;(b) provide for the adaptation to excess profits tax of any of the provisions of the Income tax Act, 1922, which are made applicable to excess profits tax by section 21; or of any rules made under any such provision;(c) provide in regard to companies whose business consists wholly or mainly in the dealing in or holding of investments, for the granting of exemption or relief from liability to excess profits tax of profits derived from investments in other companies the profits of which have been subjected to excess profits tax in the taxable territories;(d) provide for any matter which by or under this Act is to be prescribed. (3) The power to make rules conferred by this section shall be exercised in like manner as the power to make rules under section 59 of the Income tax Act, 1922.