please solve and show work

What is the life-cycle cost for an energy-saving device that costs $30,000 to install? This device, which will last for ten years, saves $6000 per year in utilities and requires on average $500 per year for maintenance and repairs, assuming that the energy cost will escalate at 5% per year and that maintenance/repair cost will escalate at 3% per year. Assume also that the owner expects a 15% rate of return for investment