各位大侠，小女子在这里请教了，有两道题目看了半天也没有解出：哪位大侠如果知道能不能告诉我，小女子不胜感激。
Price in tone CPI
YEAR 1 100 1.5%
year 5 359 1.7%
year 6 375 2.1%
What was the effective inrease of the price of the soybean, compared to the Year 5, if the Consumer Price Index had
been taken into account?
8.46 $ per tonne.??? why 375-359*1.021=8.461 为啥不用1.7%。而是用2.1%?
By how much does the CPI increase by the start of 2001 and by the end of the 2006?
设cpi 为1,依次推出1.187? IN SIXTH YEAR? Z
谢谢!!!!!!