On the map, 1 inch represents 100 miles. approximately how many miles is it from mackinac bridge to green bay? you may use your own ruler to approximate the distance between the two cities. (for accurate measurement, your screen's zoom should be set so your ruler matches the ruler shown.) 100 miles 150 miles 200 miles 250 miles

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.