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

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

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