Buildings that are constructed to be environmentally responsible are referred to as "green buildings". They cut down on energy consumption, increase water efficiency, improve indoor air quality, and use recycled materials in their construction. According to recent studies, money spent on a green building will pay for itself 10 times over the 100-year life of the building. Assuming end-of-year annual savings equal to 3% of the investment cost of the building, and assuming the residual value of the building alone (no land) after 100 years is zero, determine the internal rate of return (as a percent) for this situation. (Enter your answer as a number without the % sign.)