Suppose the working$-$age population of an economy falls into the following categories: $(1)90$ are retired, homemakers or full$-$time students; $(2)60$ have full$-$time jobs; $(3)20$ have no jobs but actively look for jobs; and $(4)10$ have no jobs, would like to have jobs, but are not actively looking for jobs.

Based on the above information, the unemployment rate is

Group of answer choices

$(20/90)\backslash$times $100.$

$(20/80)\backslash$times $100.$

$(30/180)\backslash$times $100.$

$(30/90)\backslash$times $100.$