1. The population of Ectenia is 100 people: 40 work fulltime, 20 work half-time but would prefer to work fulltime, 10 are looking for a job, 10 would like to work but are so discouraged they have given up looking, 10 are not interested in working because they are fulltime students, and 10 are retired. What is the number of unemployed in Ectenia?

a. 10

b. 20

c. 30

d. 40