please answer tgese two questions and thank u

1. The alternatives shown are to be compared on the basis of their present worth values. At an interest 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 B First cost, -50,000 -90,000 Annual operating cost, -10,000 - 4000 $ per year Salvage value, $ 13,000 15,000 Life, years 3 6 a. n = 3 years for A and n = 3 years for B b. n = 3 years for A and n = 6 years for B c. n = 6 years for A and n = 6 years for B d. None of the answers 2. For the net cash flows shown below, the maximum number of possible rate of return solutions is: Year Net Cash Flow, $ 0 -60.000 1 20,000 2 22.000 3 15.000 35,000 13,000 - 2.000 4 5 6 a. 0 b. 1 c. 2 d. 3