A recent study of 300 patients found that of 100 alcoholic patients, 87 had elevated cholesterol levels,

Question:

A recent study of 300 patients found that of 100 alcoholic patients, 87 had elevated
cholesterol levels, and of 200 nonalcoholic patients, 43 had elevated cholesterol levels. If a patient is selected at random, find the probability that the patient is the following.
a. An alcoholic with elevated cholesterol level
b. A nonalcoholic
c. Anonalcoholic with nonelevated cholesterol level