30. What is the allocation calculation for political parties to receive public funding?

Paragraph 9004 (1) The eligible candidates of each major party in a presidential election shall be entitled to equal payments under section 9006 in an amount which, in the aggregate, shall not exceed the expenditure limitations applicable to such candidates under section 441a(b)(1)(B) of title 2. (2) (A) The eligible candidates of a minor party in a presidential election shall be entitled to payments under section 9006 equal in the aggregate to an amount which bears the same ratio to the amount allowed under paragraph (1) for a major party as the number of popular votes received by the candidate for President of the minor party, as such candidate, in the preceding presidential election bears to the average number of popular votes received by the candidates for President of the major parties in the preceding presidential election.

United States Code, Title 26, Internal Revenue Code.