Answer: The club membership increased by 20%
Explanation:
A clubs Membership increased from 25 to 30 members. This means that the number of people by which the club's membership increased is
30 - 25 = 5
To determine the percentage of increase, it would be
Increase in membership/initial number of members × 100
It becomes
5/25 × 100 = 0.2 × 100 = 20%
Percentage increase is 20%