Sorry to bother you all with what might seem like a simple conversion problem, but i have tons of hw to do, and math is absolutely not my area of expertise. so, have at it, you math-wizards.

a full explanation would be greatly appreciated, too.

in 2012, germans paid 1.65 euros per liter of gasoline. at the same time, american prices were $3.90 per gallon.

a. how much would one gallon of european gas have cost in dollars?
b. how much would one liter of american gasoline have cost in euros?
(one us = 0.76 euros, 1 gallon = 3.78)