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