Sal's Market receives a box of Jen & Barry's Fast Fresh Salad BagsTM. Each box contains 16 Caesar salad bags, 20 tossed salad bags, and 12 shredded cabbage bags. Suppose that each type salad bag has an equal chance of being picked from the box. If a single salad bag is selected at random from the box, what is the probability that it is shredded cabbage?