There are 3000 students in a school and among them 20 % of them attends chess class. 40% of the students who are in the chess class are also enrolled for swimming. No other students are interested in swimming so how many will attend the swimming class if all enrolled attends? Choose the correct choice: A) 240 B) 10 C) 100 D) 50 E) 20

Rationale: "20 % of 3000 gives 600 . so 600 attends chess and 40 % of 600 gives 240 so 240 enrolled for swimming answer : a"
Answer: A