The document discusses three financial metrics used to evaluate investments: 1) ROI (Return on Investment) measures profit compared to costs and is calculated as (Return - Cost) / Cost. A higher percentage means a better ROI. 2) NPV (Net Present Value) analyzes if an investment will add value by comparing the present value of cash inflows to the initial investment. A positive NPV means the investment should be made. 3) Payback Period is the time needed to recover the initial costs from cash inflows. It is calculated by dividing the initial investment by the annual cash inflows. A shorter payback period is preferable.