Need help with making a decision tree

b) The administrators at a State University are trying to decide whether to institute mandatory drug testing for athletes. The "monetary" values listed below are used for the assessment. - Benefit B from correctly identifying a drug user and barring this person from athletics is 25 - Cost C1 of the test itself for a single athlete is 1 - Cost C2 of falsely accusing a nonuser and barring this person from athletics is 50 - Cost C3 of not identifying a drug user and allowing this person to participate in athletics is 20 - Cost C4 of violating a nonuser's privacy by performing the test is 2 (A) Have drug testing (B) No drug testing