General Electric is considering expanding their oil and gas exploration project in Alaska. The cash flow for one phase of the project involving pretotech, an oil and gas servicing company, is shown. Given reinvestment rate of 14% per year for excess funds and 10 % per year for borrowing rate for extra funds, determine: given MARR = 12% a) How many number of ROR values is expected and why? b) Calculate the external rate of return. c) Is the project economically viable