Toby exercises 14 hours a week. john exercises 20% more than toby and jenny exercises two more hours than john. which expression represents how much jenny exercises in w weeks? a) 13.2w b) 16.8w c) 18.8w d) 19.2w

Set $r$ is a set of rectangles such that (1) only the grid points shown here are used as vertices, (2) all sides are vertical or horizontal and (3) no two rectangles in the set are congruent. if $r$ contains the maximum possible number of rectangles given these conditions, what fraction of the rectangles in set $r$ are squares? express your answer as a common fraction.