A restaurant customer left 1.65 as a tip the tax was 7% and the tip was 15% of the after tax cost which information is not needed to compute the bill after tax and tip what was the total bill A. the customer left 1.65 as a tip
B. the tax was 7%
C. the customer left a 15% tip
D. all of this information is needed to solve the problem

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.