I am having trouble with this problem, can you help me?

I am having trouble with this problem, can you help me? 

You have 500 applicants and 350 job openings. The validity of your proposed test, the Reilly Statistical Logic test is .40, and the test costs $20 per applicant to administer. You have 1,000 current employees, 800 of whom are satisfactory. The salary for the position is $70,000, and the typical employee stays for about four years. Currently, you are using the Tribble Math Test with a validity of .30 that costs $25 per applicant to administer. Be sure to show your calculations for the following questions.

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