CostBenefit Evaluation:The primary objective of costbenefit analysis is to find out whether it is economically worthwhile to invest in the proposed project.
The common methods for CostBenefit Evaluation are:
 Payback Method
 Present Value Method
 Net Present Method
 Net Benefit Method
 BreakEven Method
 Cash Flow Analysis

Payback Method
Payback analysis defines the time required to recover the money spent on a project.
Formula
Payback Time=Overall cost outlay/ Annual cash return+ installation period.

Present Value Method
The payback method has certain drawbacks. The value of today’s money& tomorrow’s money is not the same. In the payback method, today’s cost is compared with tomorrow’s benefits & thus the time value of money is not considered.
The present value method compared the present value to future values by considering the time value of invested money. The present value analysis determines how much money it is worthwhile investing now, in order to receive a given return in some year’s time.
Formula
P=F/(1+r/100)
Where P is the present value
F is the future value
r is the rate of interest
n is the number of years

Net Present Value Method
This method takes into consideration the time value of money & attempts to calculate the return on investment by introducing the factor of the time element.
The net present values of all inflows& outflows of cash occurring during the entire life of the project are determined separately for each year by discounting these flows by the firm’s cost of capital.

Net Benefit Method
This method calculates net benefit by subtracting total estimated costs from total estimated benefits.

Break Even Method
In the BreakEven Method, the costs of current & new systems are compared to find the time when both are equal. The breakeven point is the time at which the cost of the new system equals the cost of the current one.

Cash Flow Analysis
In cash flow analysis method, projected expenditure& costs are identified & totaled. The difference between the incoming savings& outgoing expenses is the cash flow.