Question

At a local gas station, regular gasoline sells for $2.899 per gallon, while premium gasoline sells for $3.379 per gallon. How much does a person save on 15.25 gallons of gas by buying regular instead of premium?

Answer 1

15.25 times 3.379=51.52975
15.25 times 2.899=44.20975
51.52975-44.20975=7.32
A person will save $7.32

Shorter way:
3.379-2.899=0.48
0.48 times 15.25= $7.32