A project requires GHC100,000 investment and the expected cash flows from the project are as follows, year 1 GHC30,000, year 2 GHC35,000, year 3 GHC45,000, year 4 GHC65,000 and year 5 GHC70,000. What is the discounted payback period in number of year? The required rate is 10%