Last year the exchange rate was 0.67 euros per U.S. dollar. This year the exchange rate is 0.75 euros per U.S. dollar. What has been the change in the value of the euro over the last year? O a. 11.9% increase in the value of the euro. O b. 11.9% decrease in the value of the euro. Oc 10.7% decrease in the value of the euro. d. 10.7% increase in the value of the euro