Ken invested $200,000 for a 30% interest in a partnership in which he is a material participant. The partnership borrowed $250,000 from a bank and used the proceeds to acquire equipment. What is Ken's at-risk amount if the $250,000 was borrowed on a non-recourse loan? How could Ken's at-risk amount differ if the partnership's business involved a real estate development activity and the debt was secured by land the partnership owns?