Woodbridge Accessories is considering the purchase of a land and the construction of a new factory. The land, to be bought immediately, has a cost of $150,000 and the building, to be developed by the end of the first year, would cost $225,000. It is estimated that the firm's after- tax cash flow will be increased by $80,000 starting at the end of the second year, and that this incremental flow would increase at a constant rate of 20% per year over the next 10 years. What is the approximate discounted payback period of this investment? [Use a discount rate of 10%]