The total percentage of members in the club is 100%. Given that 60% are males, the rest are females.

Here's the solution to the problem:

a) Step 1: The total percentage of members in the club is 100%. Given that 60% are males, the rest are females. $\text{Percentage of females} = 100\% - \text{Percentage of males}$ $\text{Percentage of females} = 100\% - 60\%$ $\text{Percentage of females} = \boxed{40\%}$

b) Step 1: The total number of members in the club is 200. The percentage of males is 60%. $\text{Number of males} = \frac{Percentage of males}{100} \times \text{Total members}$ $\text{Number of males} = \frac{60}{100} \times 200$

Step 2: Calculate the number of males. $\text{Number of males} = 0.60 \times 200$ $\text{Number of males} = \boxed{120}$

c) Step 1: First, find the number of females in the club. From part (a), the percentage of females is 40%. $\text{Number of females} = \frac{Percentage of females}{100} \times \text{Total members}$ $\text{Number of females} = \frac{40}{100} \times 200$ $\text{Number of females} = 0.40 \times 200$ $\text{Number of females} = 80$

Step 2: 25% of the females are students. Calculate the number of students. $\text{Number of students} = \frac{Percentage of females who are students}{100} \times \text{Number of females}$ $\text{Number of students} = \frac{25}{100} \times 80$

Step 3: Calculate the final number of students. $\text{Number of students} = 0.25 \times 80$ $\text{Number of students} = \boxed{20}$

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