Economics Questions dealing with inflation rates

I only need questions 2a

 This is the question inside the document

https://docs.google.com/file/d/0B9WNzikXvnTlUnNfNHNqTmRCOUE/edit

Here is help to answer

https://docs.google.com/file/d/0B9WNzikXvnTlYjByQXNLamduT0k/edit?usp=drive_web

https://docs.google.com/document/d/1DMXZSObByj_f5dqeSZ1KQsg1whp6p0d3hiqo9RDG4H0/edit?usp=drive_web#heading=h.gjdgxs