IPod:

On October 22, 2007, Apple reported quarterly revenue of US$6.22 billion, of which 30.69% came from Apple notebook sales, 19.22% from desktop sales and 26% from iPod sales. Apple's 2007 year revenue increased to US$24.01 billion with US$3.5 billion in profits. Apple ended the fiscal year 2007 with US$15.4 billion in cash and no debt.

Please answer a question about this article. If the question is unanswerable, say "unanswerable". What was the value of Apple's cash assets at the end of 2007?
$15.4 billion