How you get the answer is adding all of the percents together. (100-10=90-12=79.2-23=56.2-5=51.2)
So if there were 100 applicants let’s say, 10% of 100 is 90 so 10 applicants did not meet the business requirements leaving 90. Then about 11 (10.8 exactly) people did not pass the pre-screening assessment. Leaving 79 people, 23% of the 79 people actually didn’t show up for the interview, and 23% of 79 is around 18 and 79-18= 61. Then 5% of the 61 did not pass the background investigation, which is 4 (3.5) 61-4=57, so 57 applicants were left. The company only needs 30 people to hire so automatically you know 100 applicants who applied for the job is too many, use the numbers I gave you and use the same concept to find the exact answer.