At full price, Melvin would pay 1.6791.6791.679 dollars per liter of gasoline. Using his loyalty card, Melvin only pays 1.4391.4391.439 dollars per liter. How much less does Melvin pay per liter using his loyalty card?

Melvin pays 0.24 dollars less using the loyalty card.

Step-by-step explanation:

We are given that,

Original price payed by Melvin = 1.679 dollars per liter

Using the loyalty card, He pays = 1.439 dollars per liter

So, the difference in the amount of money paid by Melvin is,

Difference = Original price - Price using loyalty card

i. e. Difference = 1.679 - 1.439 = 0.24 dollars

Hence, Melvin pays 0.24 dollars less using the loyalty card.

Melvin paid 0.24 dollars less per liter, or 14.29% less respect to the full prices

Step-by-step explanation:

Full price: 1.679 dollars per liter

With loyalty card: 1.439 dollars per liter

So, Melvin paid 1.679 - 1.439 = 0.24 dollars less per liter. In percentage term, this represents a discount of (0.24/1.679) * 100 = 14.29% respect to the full prices.