Brett currently spends $160 each month on gas.
His current car is able to travel 30 miles per
gallon of gas. He decides to switch his current
car for a new car that is able to travel 40 miles
per gallon of gas. Assuming the price of gas
stays the same, how much will he spend on gas
each month with the new car?
A) $100
B) $120
C) $130
D) $140