Lee Ann earns an annual salary a $50,000 after taxes expenses per month to come to 3350 if she stays all the money that she doesn't use to pay expenses how much will she have in savings at the end of the 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.