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21. A federal agency is considering expanding a national park by adding recreational facilities. The initial cost of the project will be $1.5 million, with an annual upkeep cost of $50,000. Public benefits have been valued at $300,000 per year, but disbenefits of $200,000 (initial cost) have also been recognized. The park is expected to be permanent. At an interest rate of 6% per year, the B/C ratio is closest to:

a. 0.71

b. 2.06

c. 2.50

d. 3.57