On July 1 of lastyear, the total number of employees at Company E was decreased by 10percent. Without any change in thesalaries of the remaining employees, the average (arithmetic mean) employeesalary was 10 percent more after the decrease in number of employees thanbefore the decrease. The total of thecombined salaries of all of the employees at Company E after July 1 last yearwas what percent of that before July 1 last year?
90%
99%
100%
101%
110%
以前员工数e,减少后是0.9e,以前e个员工总工资是s1,现在0.9个员工总工资是s2
减少员工后,平均工资s2/0.9e比减少前的平均工资s1/e多了10%,s2/0.9e=s1/e*1.1
则s2=s1*0.99
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