Suppose a country is producing $20 million of real GDP. If the economy grows at 10 percent per year, approximately how many years will to take for real GDP to grow to $80 million?
A.
14
B.
7
C.
4
D.
30
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【单选题】Mrs. McBride, my neighbor, was a fanatic (狂热的) gardener, planting lots of flowers and vegetables on the ________ at the back of her house.
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