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The Warm Muffin Bakery’s cookie sales are always 60 percent of its muffin sales. What would be the increase in The Warm Muffin Bakery’s cookie sales if its muffin sales increased from 10,000 to 20,000?
A.10,000
B.8,000
C.6,000
D.4,000
E.2,000
我的答案：