How much of my savings should I invest in my index fund? My student loan lender says they won't accept principle only payments... any other ideas on how to knock off the debt quickly? The stocks in my 401K were pre-selected for me based on a risk assessment quiz. Should I pick them based on expense ratio?Answering your questions with special co-host David Fox on this week's Ask Farnoosh.Have a question of your own you'd like to share for an upcoming episode? Visit www.somoneypodcast.com and click 'Ask Farnoosh' and submit or record your question.