(a) Certain terms used are defined for the purposes of this chapter as follows:
(b) If net earnings are determined in reliance upon consolidated earnings statements of parent and subsidiary institutions, such net earnings shall be determined after provision for income taxes of subsidiaries and after proper allowance for minority stock interest, if any, and the required coverage of fixed charges shall be computed on a basis including fixed charges and preferred dividends of subsidiaries other than those payable by such subsidiaries to the parent corporation or to any other of such subsidiaries, except that if the minority common stock interest in the subsidiary corporation is substantial, the fixed charges and preferred dividends may be apportioned in accordance with regulations prescribed by the Commissioner.