20POINTS!!!!!
 Michael and his friends like to collect Pokemon and Digimon cards. A total of 18 friends said they collect Pokemon cards, and a total of 15 friends collect Digimon cards. Four of his friends said that they collect both Pokemon and Digimon cards. 
  a. Draw a Venn Diagram.
             b. What percentage of Michael’s friends collect Pokemon cards?
             c. What percentage of Michael’s friends collect Digimon cards?
             d. Are these independent events?