You are on a business trip from Portugal to the U.S. for 90 days and you have a per diem of euro 400 per day, no receipts required. This per diem is advanced to you before the trip (euro 36,000). You deposit it into your checking account and use your Portuguese (euro) credit card to cover your costs while in the U.S. After the first two weeks of your trip, the dollar weakened against the euro by 15%. What ethical dilemma might this currency fluctuation present you?