DoomPlayz Needs 100$ for a special gift for his teacher...His Dad Gives Him 39... How Many More Does DoomPlayz Need For His Gift?

The line containing the midpoints of the legs of right triangle abc where a(-5,5), b(1, 1), and c(3, 4) are the vertices.

Iwant to know what 3g+5h+4g-2h is my teacher is too selfish to tell us

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.