A store sells paint sets. Each paint sets cost the same ammount . During a sale, the store reduces the price of paint set by $1,50 Logan spends $13,47on three paint sets at the sales price. what was the price if 1 sets at the sale?

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.