An organization that provides housing for abused women has limited housing, so it pays rent for several families. The director is considering expanding the housing facilities by purchasing a small triplex that has a useful life of 10 years. The estimated cost is $100,000. Using a discount rate of 15%, the present value of the future savings on rent is $120,000. To yield an internal rate of return that is at least 15%, the actual cost cannot exceed the estimated cost of $100,000 by more than?