[3 points) Find the value of C, which makes the following two cash flow series equivalent. Assume that the market interest rate is 6% per year. Note: There are multiple approaches to solving this problem so be sure to consider the computational efficiencies of each approach before starting! $400 $400 $400 $400 $400 $125 $125 0 1 2 3 4 5 6 7 o 1 2 3 4 5 6 7 -$250 $250 $250