Final answer:
Eric paid a total of $42.16 for his gasoline purchase, calculated by multiplying 12.4 gallons by the rate of $3.40 per gallon.
Step-by-step explanation:
To calculate how much Eric paid for gasoline, we need to multiply the number of gallons he bought by the price per gallon.
Eric bought 12.4 gallons of gasoline at $3.40 per gallon. The total cost can be calculated:
Total Cost = Number of Gallons × Cost per Gallon
Total Cost = 12.4 gallons × $3.40/gallon
Total Cost = $42.16
Therefore, Eric paid $42.16 for the gasoline.