The operating cash flow can be shown to be Build a table showing the yearly cash flows, over 10 years, with the headings cash outflow, net operating cash inflow, terminal cash inflow and net cash flow. Problem 2 - Using goal seek, calculate the internal rate of return (IRR). The operating cash flow can be shown to be Build a table showing the yearly cash flows, over 10 years, with the headings cash outflow, net operating cash inflow, terminal cash inflow and net cash flow. Problem 2 - Using goal seek, calculate the internal rate of return (IRR)