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Last year, you purchased a pint of Guinness in Ireland for 5 Euros, or 4 USD. This year, the same pint cost 5 Euros or 5 USD. What has happened to the Euro - USD exchange rate in the past year?
A. USD has weakened by 33%
B. Euro has strengthened by 25%
C. USD has strengthened by 25%
D. Nothing