I have the data something like this
Reciepents 
Sent Mails
Opens
Bounced

I want to show the following data like this

 - First whole pie for the reciepents. (100%)

 - Sent mail (80%)
 - Opens (30%)
 - bounced (20%)

**Note**: opens and bounced are the part of the sent slice.

How to display it using google pie chart or any other better way to display this information graphically.