He pays $0.24 less when using his loyalty card.
How much less does Melvin pay per liter when using his credit card?
We know that, without the card, he would pay $1.679 dollars per liter of gasoline.
With his card, he would pay $1.439
To find the relation between the two prices, we just need to take the difference between the two values (a difference is a subtraction).
d = $1.679 - $1.439 = $0.24
He pays $0.24 less when using his loyalty card.
If you want to learn more about subtractions:
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