The International Monetary Fund said the opening exchange value of the U.S. dollar against the SDR was 1.51575 versus 1.51614 on Monday. In the the week beginning April 25, the rate of interest and charges on the SDR was 2.49 percent. The rate of remuneration on members' creditor positions also was 2.49 percent. The rate of charge on members' use of fund credit was 3.39 percent, the IMF said