Suppose Tefco Corp. has a value of $100 million if it continues to operate, but has outstanding debt of $120 million that is now due. If the firm declares bankruptcy, bankruptcy costs will equal $20 million, and the remaining $80 million will go to creditors. Instead of declaring bankruptcy, management proposes to exchange the firm’s debt for a fraction of its equity in a workout. What is the minimum fraction of the firm’s equity that management would need to offer to creditors for the workout to be successful?