单项选择题

某项目采用生产能力指数法估算拟建装置的投资。已建成类似装置的投资额为200万元，生产能力为30万吨；拟建装置的生产能力为45万吨。指数n的取值为1，综合调整系数为1,20该拟建装置的投资估算额是( )万元

A.250
B.300
C.360
D.400
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