what is the net saving per dollar invested?

In September 2015, a 3.45 megawatt cooling, heating, and power (CHP) system was placed in into operation for Southeast Regional Hospital with 360 beds. The CHP system was part of a new 20,000 sq central utility plant that provided the 800.000 sq. ft health-care facility with cooling, heating and power. By centralizing all of the utilities in one location, the hospital accrued significant energy savings, as well as improved maintenance efficiency. The financial facts related to the project are summarized as Installed cost $2.7 million Annual energy cost savings S794,000 Annual O&M costs: $237,000 Project service life: 14 years Salvage value: $220,000 At an interest rate of 6%, what is the net savings. The net savings per dollar invested is $