I don't understand this probability problem.

Answer:
D. is the answer if you are given that 40% are purple and 18% are green.
Step-by-step explanation:
So if you do this with replacement, it is just P(green)*P(purple). Here the probability of purple will not be change because we are putting the first bead back in the bag.
P(green)*P(purple)=.18*.4=0.072 or 7.2%