2. Probability of two people enjoying the discount: if two people are in 180, they can enjoy the discount, that is, the probability of the first person enjoying the discount is 180/200× 100%, and the second person is one of the remaining 199 people, so the probability is/

The probability of both is180/200×100 %×179/199×100% = 80.95%.

The probability of not enjoying the discount is also 20/200×100 %×19/199×100% = 0.95%.