Question 5 (25 points) Find the external rate of return of the NCFs in the following table with 5 variations in sign and see if it is a viable investment. The minimum desirable rate of return is set as 9%. (1) Reconstruct the NCF to eliminate the negative values. (2) Calculate the external rate of return (ERR) based on the reconstructed NCF. (3) Determine the investment is viable or not and explain why. Question 5 (25 points) Find the external rate of return of the NCFs in the following table with 5 variations in sign and see if it is a viable investment. The minimum desirable rate of return is set as 9%. (1) Reconstruct the NCF to eliminate the negative values. (2) Calculate the external rate of return (ERR) based on the reconstructed NCF. (3) Determine the investment is viable or not and explain why