Probability

Procedure of a certain survey is as follow :
1. A bag contains 1 card marked " I like to drink Starbuck coffee" and 2 cards marked " I don't like to drink Starbuck coffee"
2. A person is requested to draw a card from the bag and then answer 'yes' or 'no'.
In a survey, 900 out of 1500 person answered 'yes'.
Find:
(1) Percentage of person who likes to drink Starbuck coffee.
(2) For a person answered 'yes', find the probability that he/she likes to drink Starbuck coffee.
[Ans.: (1) 20% (2) 1/9]