Michael owns a lawn care service. He charges each customer 30 + 12h dollars, where h represents the number of hours spent working on a lawn. .
Match each part of the expression with the correct answer.

30
12
12h

a.) the fee for one hour of lawn service without the basic fee
b.) the amount of money Michael earns every week
c.) the base fee for lawn service
d.) the cost for h hours of lawn service without the base fee.