Answer:
labor force = 40+20+10 = 70
So option (c) is correct option
Explanation:
We have given that the population of Ectenia = 100
In which 40 works for full time
20 work for half time but they would prefer to work full time
10 are looking for a job
10 are not interested because they are full time student
10 are retired
We have to find the labor force
Labor force will be equal to the sum of labor who are either full time working or want to do full time work or who are looking for a job
So labor force = 40+20+10 = 70
So option (c) is correct option