Of the patients reporting to a clinic with the symptoms of sore throat and fever, 25% have

Question:

Of the patients reporting to a clinic with the symptoms of sore throat and fever, 25% have strep throat, 40% have an allergy, and 10% have both.
(a) What is the probability that a patient selected at random has strep throat, an allergy, or both?
(b) Are the events "strep throat" and "allergy" independent?