Antonette shovels driveways to earn money. She can shovel 2 driveways in 1 hour. She earns $10.00 for each driveway. Antonette is saving up to buy a new phone that costs $200.00. How many hours does Antonette need to work to earn enough money to purchase the phone?

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.