A gym teacher chooses a 6-person volleyball team out of a class consisting of 4 girls and 4 boys. (a) In how many different ways could the team be formed?

(b) The gym teacher is having some trouble choosing a team, and decides to resort to randomly pulling student's names out of a hat. What is the probability that the team includes all 4 girls?

Express the probability as a percentage. If necessary, round to the nearest tenth of a percent.

Please answer all parts of the question.