一道DS题! 12版OG26页第46题.题目如下Last year the average(arithmetic mean)salary of the 10 employees of company X was 42800刀。What is the average salary of the same 10 employees this year 1)For 8 of the 10 employees.this year's salary is 15 percent greater than last year's salary 2)For 2 of the 10 employees , this year's salary is the same as last year's salary OG给的答案是E 我怎么觉得是 C阿!!!求指点 = =