English translation of the medieval German text

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... that the 800 guilders was not enough. He claims to have then wanted to satisfy him, advancing a further 800 guilders in addition to the first 800 guilders due on the basis of the aforementioned document, as a result of which he should have paid him 140 guilders interest on the additional advance of 800 guilders, and although the aforementioned Gutenberg was contractually obliged to pay interest at six percent on the first 800 guilders, he had not paid in a single year, instead of which he [Fust] had ...