3) Consider Consider two streams g cash flows: a rate S = { (-200; 0), (x; 1), (2002; 3)} and x S = { (-200; 0), (x; 2), (150; 3)} in which & is 2 real = J and positive parameten Assume exponential regime and interest 1 8 a) Determine the total present value of two streams as a a function of x b) Determine the set of values of x that make S, preffercable to S.