Ricky has $250 in debt. he needs to get the down to no more than $100 within the next 8 mouths. if he pays the same amount each month, write and solve an inequality to determine how much money he must pay off each month to manage this

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.