Anna wanted to surprise her sister for her birthday by baking her 12 cookies, or a batch of cookies. After making the cookies she decided to give 20% of them to charity. After she dropped them off, she ate 50% of the remaining cookies. She then made another batch of cookies and gave all of the remaining cookies to her sister. Answer the following questions:
How many cookies did Anna donate to charity?
How many cookies did she eat after dropping them off?
How many cookies did she give to her sister?