The document discusses three methods for evaluating investments: 1) Payback period measures the length of time required to recover the cost of an investment, with longer payback periods being less desirable. 2) Accounting rate of return divides average profit by initial investment to determine the ratio of return, allowing easy comparison of different investment opportunities. 3) Net present value calculates the difference between the present value of cash inflows and outflows, used in capital budgeting to analyze investment profitability.