问题如下图：
选项：
A. 
B. 
C. 
解释：
老师好，为什么用year 2 和year 0 然后开方求这种形式的CAGR，而不是直接用year 2 相对year 0 的增长率直接比较？
这类题必须要这么算吗？有这样的规定或者知识点吗？
有没有什么例外情况，比如有的公司给三年，有的给一年，这类应该如何比较？
麻烦老师帮忙做做知识点的引申，和补充。
NO.PZ201710020100000207 问题如下 7 Baseon Exhibit 1, whigovernment polihbeen most effective in helping Genovia achieve its seconinitiative? A.Ton fossil fuels B.Subsi on hyopower C.Subsi on other renewables C is correct. the enof Ye2, the compounannugrowth rate (CAGR) for easector is calculatefollows: (Ye2/Ye0)0.5 – 1Fossil fuels = (426/462)0.5 – 1 = –4% Hyopower = (273/186)0.5 – 1 = 21% Other renewables = (154/97)0.5 – 1 = 26%.The CAGR incates ththe 26% increase in proction from the subsi on other renewables hbeen more effective ththe 4% crease in proction from the ton fossil fuels or the 21% increase in proction from the subsi on hyopower. Thus, the subsi on other renewables of 26% is the highest, incating ththis polihbeen the most effective in helping Genovia achieve its seconinitiative.考点Regulatory Tools解析首先我们根据表格计算一下政府实施政策后，不同发电来源产电的变化。Fossil fuels = (426/462)0.5– 1 = –4%Hyopower = (273/186)0.5– 1 = 21%Other renewables = (154/97)0.5 – 1 = 26%.从计算结果看，石化燃料发电降低了4%，风力发电增加了21%，其他再生资源发电增加了26%。因此从环保节能的角度而言，其他再生资源收获的效果最大。 如果是四年，计算公式是什么？
NO.PZ201710020100000207 No.PZ2018091706000055 (选择题)来源: 品职出题 Recently Analyst Bob is stuing regulatory environment in a country. 4 years ago, the country aocates environment-frieny power generation. So the government increases taxes on cofuel anprovis subsies on solpower anwinpower generation. Bob fin some changes in electricity generation proction following table shows. Accorng to the table, whigovernment poliis most effective? 为什么不选C？
要是算占比，直接finvalue / initivalue -1 不就好了？ 为什么要开方？
算哪个政策影响最大不是用减法么？ 答案是用占比率，不是比较绝对值么
使用（year2-year0)/year0再开方，与(year2/year0)0.5-1求出来的值不应该都是年化增长率？为什么选择第二种计算方式？
