The calculation of the net present value (NPV) internal rate of return (EIRR) in economics, and the ratio of benefits per cost (B/C Ratio) for the economic analysis, the value of the variable is used in both the costs and the benefits that are possible in the calculation of cost and benefit flows. However, the future value is difficult to forecast, and sometimes there is a bias caused by many different factors, and therefore need to have an analysis of the impact of the value of the variable changes. By the way, this will help assess the impact of the change of economic indices and analysis continue to project decisions.
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