Madelyn owns a small pottery factory. She can make 1,000 pieces of pottery per year and sell them for $100 each. It costs Madelyn $20,000 for the raw materials to produce the 1,000 pieces of pottery. She has invested $100,000 in her factory and equipment: $50,000 from her savings and $50,000 borrowed at 10 percent (assume that she could have loaned her money out at 10 percent, too). Madelyn can work at a competing pottery factory for $40,000 per year. The economic profit at madelyn's pottery factory is: