Kevin O'Leary (also known as Mr. Wonderful) is accustomed to providing input to entrepreneurs on ABC's Shark Tank. But he also doesn't mind sharing his advice with others who will never appear on the popular TV show.

In a recent appearance on Good Morning America, O'Leary answered viewers' questions about investing and personal finance. The Shark Tank star revealed what he thinks is the one thing you need to do to retire with $1.5 million. 

Image source: Getty Images.

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Source Fool.com