If a sales agent's rental payments for premises are contractually computed in whole or in part on the basis of a percentage of the lessee's retail sales and if the computation of the lessee's rental payment is not explicitly defined to include sales of tickets in a state-operated lottery, the compensation received by the sales agent from the lottery is considered to be the net amount of the lessee's retail sales of tickets for the purpose of computing the rental payment.
Tex. Gov't. Code § 466.359