45%+45%+9.99%=99.99%

100%-99.99%=.01%

Presuming that you have appointed your Arabic speaking lady from the remaining candidates which is 0.01% & there must have been atleast 1 candidate for you to select the successful candidate from we can say that

 0.01%=1 candidate. Which makes the total number of applicants=10000

Now if there were 2 eligible candidates that would mean the number of applicants were 20000.