单选题：某商店以每3件l6元的价格购进一批商品，又从另外一处以每4件21元的价格购进比前一批数量加倍的该商品，如果以现在的价格全

题目内容：

某商店以每3件l6元的价格购进一批商品，又从另外一处以每4件21元的价格购进比前一批数量加倍的该商品，如果以现在的价格全部出售可得到所投资八成的收益，求现在每件多少元? A．8.5
B．9
C．9.5
D．10

参考答案：

答案解析：

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