The following two cash flows are said to be economically equivalent at 15 % interest. Determine the value of x for the second cash flow series. You are required to employ uniform and gradient series concepts (using formula or economic factors in your solution). $ 1000 $ 800 $ 900 $ 600 $ 600 $ 700 0 1 2 3 4 5 X+$200 X+$300 + X+$ 100 1 0.5 X O 2 3 4