I make €100 a day.

I earn 100 Euros a day.

I make 100 euros per day.

I make 100 euros a day.

Source: Tatoeba

This is not in euros. It is in American dollars.

Source: Tatoeba

This will cost €30.

Source: Tatoeba

I make €100 a day.

Source: Tatoeba

"That roll looks quite nice. What's in it?" "Salami, cucumber, lettuce and egg. It was quite dear, as well. It cost €2.50."

Source: Tatoeba