In 198*, 1 US dollar can exchange for 252 Japanese Yens; in 199*,

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In 198*, 1 US dollar can exchange for 252 Japanese Yens; in 199*, 1 US dollar can exchange for 89 Japanese Yens. Approximately how much more is the cost of US dollars of 10,000 Yens in 199* than that in 198*?

答案：70.0

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请问这题答案不是72.7吗？

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这个70是怎么算出来的，题目说approximately 是要估值到一个整数吗

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