Find the probability (Grandma bakes chocolate chip cookies in batches of 100)

Grandma bakes chocolate chip cookies in batches of 100. She puts 300 chips into the dough. When the cookies are done, she gives you one.

a) What is the probability that your cookie contains at least 2 chocolate chips?

b) Grandma decided to add chips to the dough so that only 1% of the cookies will contain no chips. How many chips must she include in a batch of 100 cookies to achieve this?