sandy wrote:
Regular gas costs $3.00 a gallon and is consumed at a rate of 25 miles per gallon. Premium costs $4.00 a gallon and is consumed at a rate of 30 miles per gallon. How much more will it cost to use premium rather than regular for a 300-mile trip?
(A) $1
(B) $4
(C) $5
(D) $36
(E) $40
For a 300-mile trip, we need 300/25 = 12 gallons of regular gas, which costs 12 x 3 = $36. For a trip of the same distance, we need 300/30 = 10 gallons of premium gas, which costs 10 x 4 = $40. Thus the premium gas costs 40 - 36 = $4 more than the regular gas for a 300-mile trip.
Answer: B