We refueled for 50 Euros. The unit price of fuel is 1.250 Euros/liter. The car's consumption is 5 liters per 100 km.

So:

50 / 1.250 = 40

We refueled 40 liters

40 / 5 = 8 * 100 = 800

With the refueled fuel worth 50 Euros, we can travel approximately 800 km

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