the correct answer is: " 3.6 % " .
→ the unemployment rate is: " 3.6 % " .
explanation:
to calculate the "unemployment rate" :
the "unemployment rate" =
[# of people unemployed] / [working age population] * 100 % ;
= [9 million] / [250 million] * 100 % ;
→ note: the units of "million" cancel out;
since: " {million} / {million} = 1 " ;
= (9 / 250) * 100 % ;
= 0.036 * 100 % ;
= 3.6 %
answer: the unemployment rate is: " 3.6 % " .