A company is considering an external long-term contract offer that improve the energy efficiency of their systems. The payment schedule has two large payments in the first years with continuing payments thereafter. The proposed schedule is $230,000 now, $120,000 six years from now, $30,000 every four years, and an annual amount of $8,000 beginning 15 years from now. Project save $31,000 in energy costs annually for entire of its unlimited life. Using the capitalized cost method at 5% per year, the present worth of Benefits minus Costs is closest to:
a. - 60,000
b. 20,000
c. 80,000
d. 140,000