Solve this:
Q. An investigator wants to collect information related to economic conditions (salary, P.F., House rent etc.) of the workers of company XYZ. Which method of primary data collection should be adopted by investigator? Explain any two demerits of this method.
 

Personal interview in which the enumerator can directly go from one to another for asking the necessary information. 
Demerits- 
Time consuming - Since the person has to go from one person to another directly it is so time consuming to conduct the interview.
Expensive - It is also expensive because we need trained enumerators for this purpose and also the travelling cost is high.