When a unit organizes sightseeing tours for employees, the charging standard of the travel agency is: if the number of employees does not exceed 25, the per capita travel expense is 100 yuan; If there

When a unit organizes sightseeing tours for employees, the charging standard of the travel agency is: if the number of employees does not exceed 25, the per capita travel expense is 100 yuan; If there are more than 25 people Let's assume that there are x people taking part in the tour in this unit.

∵ 100×2525.

[ 100-2(x-25)]x=2700，

x2-75x+ 1350=0，

X 1=30，x2=45，

When x=30, 100-2 (x-25) = 90 > 70, which is consistent with the meaning of the question;

When x=45, 100-2 (x-25) = 60 < 70, which does not meet the meaning of the question;

A: There are 30 people in this unit who took part in this tour.