145 130 120 115
—— —— —— —— composite index =130
6 5-n n 4
这题怎么做??作者: candy6780 时间: 2012-1-12 09:01 PM 标题: add mat index number
based on the year 2003,the index undex number of an item in the year 2006 and 2009 is x and 145 respectively.
based on the year 2006, the index number in the year 2009 is 120.calculate value of x.