Receipts or rentals or charges for real property, personal property or services do not lose their character as payments of a fixed sum or as bona fide because of provisions in a contract, lease or license for adjustments in charges, rentals or fees on account of changes in taxes or assessments, escalations in the cost-of-living index, expansions or improvement of facilities, or changes in services supplied. Receipts of rentals or charges based on percentage between a corporate licensee or a licensee who is a limited partnership and the entities enumerated in paragraph (c) are permitted under this subsection.
Miss. Code § 75-76-57