What are the growth rates for Amazon.com Inc (and how do I calculate them)?

This is how far I've gotten:

ROE= net income/total equity

ROE= -$39,000,000/$8,192,000,000

ROE= -0.48%

ROA= net income/total assets

ROA= -$39,000,000/$32,555,000,000

ROA= -1.2%

Plowback Ratio= Addition to Retained Earnings/Net Income

Plowback Ratio= 0/-39,000

Internal Growth Rate= [ROA x (plowback ratio)]/[1-ROA x (1- plowback ratio)]

Amazon paid out no dividend in 2012, and have a net loss of $39,000, so there was no addition to retained earnings.

The full financial info that I am using comes from Yahoo Finance.