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wo. me alternatives shown are to be compared on the basis of their present worth values. A erest rate of 10% per year, the values of n that you should use in the uniform series factors to make a correct comparison by the present worth method are: Alternative A Alternative First Cost, $ Annual Operating cost, $ /year Salvage Value, $ Life years -40.000 -10,000 13.000 -90,000 -4.000 15,000 8 (a) n= 48 years for A and n= 48 years for B (b) n=8 years for A and n= 6 years for B (c) n=24 years for A and n=24 years for B (d) None of the above