8. The project to construct a subway in Washington, D.C., began in the early 1970s with the expectation that it would be fully operational by 1980. A portion of the system opened in 1977, but as of 2004, approximately 5% remained unfinished.What do you think were the costs, benefits, and risks involved in the original planning? How important was the interest rate used in those calculations? Speculate on who or what was to blame for the lengthy delay in completion.