Kramer purchased his partnership interest from Mike on the first day of the current year for $40,000 cash. Jill and Judy are also partner in this business. Kramer's received a $10,000 cash distribution from the partnership during the year, and his share of partnership income is $15,000. His share of partnership liabilities on the last day of the partnership year is $20,000. Kramer's outside basis for his partnership interest at the end of the year is $______.Please show your calculations