Mich. Comp. Laws § 432.12: Apportionment of revenue for payment of prizes; percentage.

Sec. 12.

(1) Except as otherwise provided in subsection (2), as nearly as is practicable, not less than 45% of the total annual revenue accruing from the sale of lottery tickets or shares shall be apportioned for payment of prizes to the holders of winning tickets or shares.

(2) Notwithstanding subsection (1), the prize money from the sale of tickets or shares of any joint enterprise is that percentage of the total annual revenue accrued from that game as prescribed by the joint enterprise participation agreement executed by the commissioner.