please answer using excel and explain

17) You are offered an investment that will pay the following cash flows at the end of each of the next five years at a cost of $800. What is the Internal Rate of Return (IRR)? Use Excel's =IRR(B4:B9) function. Notice that the IRR function does take the initial outlay into account automatically. The IRR function is actually defined as =IRR(values, [guess]). The "guess" argument, a number close to the IRR, is optional and is generally not needed