DigiServe is considering investing in a roof-top solar network to generate its own power. Any unused power will be sold back to the local utility company. Between cost savings and new revenues, the company expects to generate $1,500,000 per year in net cash inflows from the solar network installation. The turbine would cost $8 million and is expected to have a 20-year useful life with no residual value. Calculate the payback period and the AARR