Michael earns a base salary of $100.00 every week with an additional 9% commission on everything he sells. if michael sold $4950.00 worth of items last week, what was his total pay?

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.