In addition, the seller may receive or demand the cost of any ancillary goods which the buyer has consumed or wishes to retain after cancellation of the contract. In no instance shall the seller collect more than the full contract price from the buyer.
If you cancel this contract (the seller) may keep only five percent of the cash price, but not to exceed fifty dollars, and a portion of the contract price based upon the lessons or services you have used. You may notify the seller of your intent to cancel by mail, addressed to (the seller) at (seller's address).
N.Y. Pers. Prop. Law § 412-A