What is the answer to this question ?

Find the balance at the end of 4 years if 1000 is deposited at the rate of

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.

The area of the map is the product of the length and width. write and expression for the area as the product of the two binomials do not multiply