The accompanying tree diagram represents a two-stage experiment. (Let x = 0.3, y = 0.7, r = 0.55, s = 0.45, t = 0.55, and w = 0.45.)

Question

The accompanying tree diagram represents a two-stage experiment. (Let x = 0.3, y = 0.7, r = 0.55, s = 0.45, t = 0.55, and w = 0.45.)
(a) Find P(A) · P(D | A).
  
Correct: Your answer is correct.

(b) Find P(B) · P(D | B).
  
Incorrect: Your answer is incorrect.

(c) Find P(A | D).