According to Google, 44 Euro = 49 USD at today's exchange rate (1 to 1.11), but that is probably not the cash rate. so you might have lost $2 to $3 on the exchange.

With regard to the tip, like Kim, my head hurts when this comes up. But my understanding is that the prices on the French side are a bit higher and the staff are paid better than in US/Canada and therefore do not rely as much on tips.

But only you can determine of the $2 - $3 plus a tip that you gave willingly constitutes being taken. I think you should go with EdB's analysis: Did you enjoy your day? If so, focus on that.