“The unemployment rate is 15%”.
Step-by-step explanation:
Unemployment rate is defined as the percentage of persons who are not working currently in the civilian labor force, but are in the search of jobs. When we talk about civilian labor force, it includes people “16 years” or “older” who are searching for jobs or working and looking for jobs.

Here, Labor force = 100 million
And Unemployed = 15 million
So,
Unemployment rate = 15%.