This article analyzes whether Karen can terminate her contract with Gym & Tonic and if she is liable to pay the $100 fee. It examines the relevant laws, including Section 18 of the Australian Consumer Law and Section 52 of the Trade Practices Act, and applies them to the case. The article concludes that Karen has the right to terminate the contract and not pay the fee due to misrepresentation by Gym & Tonic. It also discusses possible remedies, including rescission and compensation.