题目内容：
Assume that a bank's bid rate on Swiss francs is $.45 and its ask rate is $.47.Its bid-ask percentage spread is:
A.about 4.44%
B.about 4.26%.
C.about 4.03%.
D.about 4.17%.
参考答案：
选择题：Assume that a banks bid rate on Swiss francs is $.45 and its
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