At Daifu university, \(40\%\) of all students are members of both a chess club and a swim team. If \(20\%\) of members

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At Daifu university, \(40\%\) of all students are members of both a chess club and a swim team. If \(20\%\) of members of the swim team are not members of the chess club, what percentage of all Daifu students are members of the swim team?

A) \(20\%\)
B) \(30\%\)
C) \(40\%\)
D) \(50\%\)
E) \(60\%\)

Answer: D

Source: GMAT Club Tests