Employment data at a large company reveal that 75% of the workers are married, 42% are college graduates, and half of the college grads are married. Complete parts a through c below.

a) What's the probability that a randomly chosen worker is neither married nor a college graduate? (Type an integer or a decimal. Do not round.)
b) What's the probability that a randomly chosen worker is married but not a college graduate? (Type an integer or a decimal. Do not round.)
c) What's the probability that a randomly chosen worker is married or a college graduate? (Type an integer or a decimal. Do not round.)