A bookstore is planning to purchase an automated inventory/remote marketing system, which includes an upgrade to a more sophisticated cash register system. The package has an initial investment cost of $360,000. It is expected to generate $144,000 of annual cash flows, reduce costs and provide incremental cash revenues of $326,000, and incur incremental cash expenses of $200,000 annually. What is the payback period and accounting rate of return (ARR)? Show work and formula.