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针对水利部印发的水建〔1998〕15号文中指定的复利计算法 ,笔者提出了简便易用的计算公式 ,同时证明了简化算法与 15号文中复利计算法的等式关系。另外 ,通过简化公式的推导 ,搞清了 15号文颁发前水利水电工程设计概 (估 )算中的建设期还贷利息和经济评价中的建贷利息计算结果不同的根本原因。即两种方法所依据的理论不同 ,前者基于单利法 ,而后者基于复利法 ,并推导出两种算法的差值公式
In response to the compound interest calculation method specified in Water Construction [1998] No. 15 issued by the Ministry of Water Resources, the author proposed an easy-to-use calculation formula, and at the same time, proved the relationship between the simplified algorithm and the compound interest calculation method in the No. 15 document. In addition, through the simplification of formula derivation, we have found out the basic reasons for the different calculation results of the construction loan repayment interest during the construction design (estimate) calculation of the water conservancy and hydropower project before the issuance of Circular No. 15 and the economic evaluation. That is, the two methods are based on different theories. The former is based on the simple interest method, while the latter is based on the compound interest method and derives the difference formulas of the two algorithms.