Charles has decided to open a lawn-mowing company. To do so, he purchases mowing equipment for $4,000, buys gasoline ($2.30 in gas is required to mow each yard), and pays a helper $20.00 per yard. What is the total cost of mowing a yard if gas prices remain constant?
A) $2.30
B) $22.30
C) $24.00
D) $40.00
