7.1.3.3 The principle calculation:
Based on investment calculations calculate annual management costs, benefits earned before and after the project during the economic activities of the project (life economics of the project). For projects Irrigation and economic life of the project equal to 30 years. All calculated values are generally taken out money present value (NPV) and then calculate the economic indicators such as IRR, to conclude on the economics of the project
7.2 Calculation of economic indicators :
7.2.1 The basic concept and calculation methods:
7.2.1.1 Rate of depreciation (DF):
- The rate of depreciation is the ability to reduce the value of a physical volume are monetized in% ( due to the devaluation of the currency over time).
- Symbol: DF.
- DF reflecting the payback of a certain project.
7.2.1.2 Value current net income (NPV):
Value Current net income is the net present value of total net income (carried interest) throughout the economic life of the project be converted present time.
NPV = (7.1)
In which:
+ Bt: the income due projects bring in interval calculations t.
+ Ct is the total actual cost of the project in the first paragraph t.
+ i: the interest rate periods when the project must bear (discount factor).
+ T is the number of operating segments as calculated Project
+ t: is the index run in chronological order calculating section of the project (t = 0 T).
+ If NPV 0 Investment projects efficient in economic terms.
+ If NPV <0 Investment projects inefficient economically.
When calculating the value converted to the later years of the present time. Values taken at present by the formula:
P = Kt. Gt (7. 2)
In which:
+ P: the value of year t provided for the first year.
+ Gt: material values are monetized by year t.
+ Kt: depreciation ratio of year t with its rate of depreciation.
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