The amount Troy charges to mow a lawn is proportional to the time it takes him to mow the lawn. Troy
charges $30 to mow a lawn that took him 1.5 hours to mow.
Which equation models the amount in dollars, d, Troy charges when it takes him h hours to mow a lawn?
A.
d = 45h
B.
h = 20d
C.
d = 20h
D.
h = 45d