In the survey of 400 members of the local sports club, 200 members indicated that they plan to attend next Summer Olympic Games, 120 members indicated that they plan to attend next Winter Olympic Games, and 80 members indicated that they plan to attend both games. How many members of club plan to attend
(i) At least one of two games?
(ii) Exactly one of games?
(iii) Summer Olympic Games only?
(iv) None of the games?