The Secretary of Agriculture shall charge a rental charge for all ski area permits issued pursuant to section 3 of the National Forest Ski Area Permit Act of 1986 (16
), the Act of March 4, 1915 (38 Stat. 1101
, chapter 144; 16
), or the 9th through 20th paragraphs under the heading “SURVEYING THE PUBLIC LANDS” under the heading “UNDER THE DEPARTMENT OF THE INTERIOR” in the Act of June 4, 1897 (30 Stat. 34
, chapter 2), on National Forest System lands. Permit rental charges for permits issued pursuant to the National Forest Ski Area Permit Act of 1986 shall be calculated as set forth in subsection (b) of this section. Permit rental charges for existing ski area permits issued pursuant to the Act of March 4, 1915, and the Act of June 4, 1897, shall be calculated in accordance with those existing permits: Provided, That a permittee may, at the permittee’s option, use the calculation method set forth in subsection (b) of this section.