Final answer:
The fee paid yearly by a client to maintain a club sun membership is known as an annual membership fee, which varies based on club services and can often be discounted compared to other payment schedules.
Step-by-step explanation:
The fee that a client pays once a year to be a club sun member is commonly referred to as an annual membership fee. This fee is charged to maintain the membership status and avail the services and benefits offered by the club for the duration of one year.
The specific amount of the annual fee can vary widely depending on the club's offerings, amenities, and location. It is typically outlined in the membership agreement or discussed upon inquiring about membership. Some clubs might also offer additional payment options such as monthly or quarterly payments, but paying annually often comes with the convenience of a one-time charge and sometimes even a discount compared to other payment intervals.