Answer:  Plan B is better than Plan A as B is cheaper than A.
Step-by-step explanation:
Since we have given that 
Plan A consist of :
Amount for monthly membership fee = $50
Cost per visit = $10
Equation of total fees would be 

Plan B consist of :
Amount for monthly one time membership fee = $25
Cost per visit = 15
Equation of total fees would be

Here , x denotes the number of visits.
Let us suppose x = 1
Then , fees for plan A would be 

Fees for plan B would be 

Hence, Plan B is better than Plan A as B is cheaper than A.