John wants to invest in commercial real estate project, the estimation of NCF is: the initial (year 0) investment is 1000 million $, the net cashflow income in the following 3 year is 300 million; The project requires a further investment 500 million $ in year 4, and the net cash flow in the following 3 year will still be 300 million $. 11 0 1 2 3 4 5 6 7 Net Cash Flow -1000 300 300 300 --500 300 300 300 Assignment Please use . 1) linear interpolation method: 2) TRR function of Excel. to derive the Internal rate of return (IRR) of this project