More than just the answer, I need to know how to solve it. Thanks

Suppose Daisy Mae's Sweets is considering investing in warehouse -management software that costs $450,000, has $35,000 residual value, and should lead to cost savings of $130,000 per year for its five-year life. In calculating the ARR, which of the following figures should be used as the equation's denominator (average amount invested in the asset)? $485,000 $242, 500 $207, 500 $225,000