7.1.3.3 the principle of calculation: Based on the capital calculation to calculate the annual management fees, interest income before and after have the project throughout the project's economic activities (the economic life of the project). For Irrigation projects in the economic life of the project in 30 years. All the calculated value is often calculated out of the money put on the present value (NPV) then calculate the economic targets such as IRR, to conclude about the economics of the project 7.2 calculate the economic indicators: 7.2.1 The basic concepts and methods of calculation:7.2.1.1 the rate of depreciation (DF): -The rate of depreciation is likely to reduce the value of a block of material are calculated according to the% of money (due to the falling price of money from time to time). -The symbol: DF. -DF reflects the level of divestment of a project.7.2.1.2 the value of current net income (NPV): Current net income value NPV is the total amount of net income (profit) throughout the life of the project is calculated on the present moment. NPV = (7.1) Of which:+ Bt: income is due to the project to bring in the second calculation interval t.+ Ct: is the total cost of the project at the time t.+ i: is the interest rate according to the duration that the project should be subject (coefficient of discounting).+ T: is the number of the active duration, as calculated by the project+ t: is index run by the order of calculation of the duration of the project (t = 0 T ).+ If NPV 0 project economically effective.+ If NPV < 0 investment project is not economically effective. When calculating the value of the attribute must be in the following years of the present time. The value put on the moment, calculated according to the formula:P = Kt. GT (7.2) Of which:+ P: value of year t rules about the early years.+ Gt: the material values are out of the money of the year t.+ Kt: the ratio of depreciation of year t with its depreciation rates.
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