The PTA at Weston high school is having its annual dinner and auction to raise money for music and art programs last year the event raced $63,300 this year it raised 32% less how much was raised this year

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.