[4] 1. The initial cost of constructing a permanent dam (i.e., a dam that is expected to last forever) is $425 million. The annual net benefits will depend on the amount of rainfall: \$18 million in a "dry" year, \$29 million in a "wet" year, and \$52 million in a "flood" year. Meteorological records indicate that over the last 100 years there have been 86 "dry" years, 12 "wet" years, and 2 "flood" years. Assume the annual benefits, measured in real dollars, begin to accrue at the end of the first year. Using the meteorological records as a basis for prediction, what are the net benefits of the dam if the real discount rate is 5 percent? [2] b) What is the internal rate of return