The 401(k) was built on a simple idea. Save money from each paycheck for tomorrow and get a tax break today. But deciding how much of your money should go into a Roth versus traditional 401(k) can be overwhelming. On October 5, at 1 p.m. ET, the Journal’s Personal Finance Bureau Chief Jeremy Olshan sits down with personal finance reporter Anne Tergesen to discuss investment strategies and weigh in on your questions.