Joseph is an electrician who charges a travel fee to each customer. He also charges an hourly fee of service. The table below represents how much he charges for up to 5 hours of service. H C

0 35
1 95
2 155
3 215
4 275
5 335

Which equation represents the cost, C , of H hours of service?

A: C=35h-60

B: C = 35h + 60

C: C=60h - 35

D: C = 60h +35

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.