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请教一道数学题(og上的)

A farmer has a field that measures 1000 ft wide by 2000 ft long. There is an untillable strip 20 ft wide on the inside edge of the field, and a 30 ft wide untillable strip bisects the field into two squares (approximate). Approximately what percentage of the field is tillable?

A)98%
B)93%
C)91%
D)90%
E)88%

确切的说是没看明白题目。。多谢。。[em04][em05]
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答案是什麼?
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b?

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我算也是b
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ft...讲讲吧。。

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