The prices of paperbacks sold at a used bookstore are approximately Normally distributed, with a mean of $7.85 and a standard deviation of $1.25. Use the z-table to answer the question.

If the probability that Joel randomly selects a book in the D dollars or less range is 56%, what is the value of D?

$4.46

$7.75

$8.04

$8.10

(C) 8.04

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.