Let the roots $x_1, x_2, x_3$ and $x_{4}$ of equation $x^{4}-20x^{3}+85x^{2}-100x+n=0, n\ \in\ R$ are such that $x_{1}x_{4}=x_{2}x_{3}$ The value of $n$ is
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Let the roots $x_1, x_2, x_3$ and $x_{4}$ of equation $x^{4}-20x^{3}+85x^{2}-100x+n=0, n\ \in\ R$ are such that $x_{1}x_{4}=x_{2}x_{3}$ The value of $n$ is