用总体回报除以购买价格即可得到这个数字。
You do that by dividing the total return by your purchase price.
这会在信用分布的权重下导出一个6.4%的总体回报。
This would result in an overall return, weighted by the distribution of credit grades, of 6.4%.
总体上看，普通的美国人需要承担和奥巴马先生提案同样的价格上涨负担，但同时获得更少的回报。
Overall, ordinary Americans will endure price hikes just as severe as they would have under Mr Obama’s plan, while receiving far less compensation.
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