A sporting goods store sells two different footballs. In one year, 92 footballs were sold for a total of revenue of $4,273. Rawlings footballs cost $45 and Nike footballs cost $52. Find the number of each type of football
sold

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.