Can I get some help with working out for this question.

Required Calculate the project's payback period in years. The Happy Day Care Centre is considering an investment that will require an initial cash outlay of $300 000 to purchase non-depreciable assets that have a 10-year life. The organisation requires a minimum four-year payback. Required Assuming the investment generates equivalent annual cash flows, what minimum amount of annual cash flows must be generated by the project for the company to make the investment