??????????????????????? ?????????????? ?????????????????????

????????2??????????飬??????????????????????????(?????????????????)??

1??????(15%)????????????ò??100?????????????

2??????(30%)??200????????????????150?????????????????112?????????

3??????(45%)??400????????????????350?????????????????330?????????

4????(60%)??800????????????????700?????????????????680?????????

5??????(75%)??1500????????????????1400????????????????????????????????δ??????

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