Х Financial Literacy - 0/10
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Sean earned $31,000 last year. If the first $25,000 is taxed at 9% and income above that is taxed at 15%,
how much does Sean owe in tax?

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.