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题目材料：
If the total annual booksales in 1992 was $50.0 million and if this total increased by at least $1.0 million annually from 1992 to 1996, what was the greatest possible annual increase in this total from 1992 to 1996?
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A.$5.0 million
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B.$6.0 million
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C.$7.0 million
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D.$8.0 million
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E.$9.0 million
C显示答案
