I'm stuck on one of my homework problems.

Let A and B be mutually Exclusive events where P(A)=0.3 and P(B)=0.4

a. Find the Probability that both A and B occur.

b. Find the probability that either of A or b occur.

c. Find the probability that B occurs but A does not occur.

d. Find the probability that neither occurs.

For part a I got 0

For part b I got 0.7

I don't know how to figure out part c and d. Can anyone please help?