Donna rolled 2 number cubes each labeled 1 to 6. After each roll, she found the product of the two numbers rolled. If Donna does this 400 times, about how many times should she expect to get a product that is a multiple of 5?
O A 75
OB. 100
OC. 125
OD 150

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.