Find the amount in an account if $35,200 is invested at 3.2% compounded semi-annually, for 7 years.
Enter the answer in dollars and cents, and round to the nearest cent, if needed.
Do not include the dollar sign. For example, if the answer is $0.61, only the
number 0.61 should be entered.

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.