The unit of currency in Japan is the Japanese Yen (JPY). If rrepresents the conversion rate, U. S. Dollars (d) can be converted into Japanese Yen using the expression below. rxd
What conversion rate do you need to get at least JPY 1,324 in exchange for $1,000 U. S. dollars?

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.