The Project incomes, the beginning of the period and end of the period values ($ 000) are in the following table. WACC (discount rate) is 12% and alternative return is 15%. Compute the cash flow to determine the optimum renewal period

periods project incomes En the beginning of the period R(n-1) end of the period Rn

1 1200 2400 2100

2 1530 2100 1800

3 840 1800 1200

4 660 1200 600

5 420 600 0