We want to travel 400 km. The average fuel consumption per 100 km is 5 liters. The price of 1 liter of fuel is 1.250 Eur.

So:

400 / 5 = 80

We will need 80 liters for 400 km.

80 * 1.250 = 100

The fuel cost for 400 km with a consumption of 5 l/100km is 100 Eur

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