SECTION 105.
Paragraph 8 of section 30 of chapter 63 of the General Laws, as so appearing, is hereby amended by striking out the first sentence and inserting in place thereof the following sentence:- The net worth of a business corporation taxable under section 39 shall be calculated as follows: (a) the book value of its total assets on the last day of the taxable year shall be reduced by the sum of (1) its liabilities on said date, (2) the book value of its tangible property situated in the commonwealth on said date and subject to local taxation, less the interest of any mortgagee therein, and (3) the book value on said date of its investment in subsidiary business corporations which represent 80 per cent or more of the voting stock of said subsidiary business corporations or, in the case of a subsidiary business corporation which does not have voting stock, the book value of its investment in such business corporation which represents 80 per cent or more ownership interest; (b) the amount determined in (a) shall be multiplied by such corporation's income apportionment percentage, as determined under section 38.