Its economic internal rate of return is 13.41%, larger than its social discount rate 12%, therefore, the project is economically rational.

该工程的经济内部收益率为13.41%，大于社会贴现率12%，所以该工程在经济上是合理的。

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The internal rate of return represents the true interest rate earned in an investment over its economic life.

内含报酬率是项目在其寿命周期内所实现的真实收益率。

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