See attached image. Please submit an excel file and whatever material is necessary

In reviewing current operating processes, the company accountant has provided you with the following information about a small chemical process that was built ten years ago. Capital investment = $30 times 10^6 ($10 times 10^6 at the end of year 1, $15 times 10^6 at the end of year 2, $5 times 10^6 at the end of year 3. Working capital = $10 times 10^6) Over the last ten years, the average (after-tax) return on investment that non-process projects have yielded is 10%. a. What is the DCFROR for this project over the last 12 years? (Ignore land and working capital costs.) b. In retrospect, was the decision to build this plant a good one