need help in this probability and statistic question with steps, thankss

(a) In a sample of 100 BBA students, 40 take accounting , 40 take finance , 20 take global. Twenty five percent of those taking accounting also take finance; thirty percent of those taking finance also take global; and fifty percent of those taking global also take accounting. In addition, 3 of them take all three subjects. Suppose that a student is randomly chosen from this sample. (i) Find the probability that the chosen student takes accounting only. (11) Given that the student takes finance, what is the probability that he/she is not taking accounting ? (iii) Find the probability that the chosen student takes accounting or global