Sir i am stuck for this question

The occupational health department decides to vaccinate only employees over 50 in a company. Of the total workforce of 1,200, 400 are over 50. There was an epidemic during the winter: 20% of unvaccinated employees got the flu and 3% of vaccinated employees got the flu. 1) Complete the cross tabulation below. Vaccinated Non-vaccinated Total employees employees Employees who had the flu Employees who did not have the flu Total 400 1 200 2) An employee is chosen at random, what is the probability that he/she is vaccinated and has not had the flu?3) What is the probability of an employee being vaccinated? 4) What is the probability that an employee will be vaccinated knowing that they have had the flu