These, it seemed, were calculations of compound interest on what he called ’the principal amount of forty-one, ten, eleven and a half’, for various periods.
After a careful consideration of these, and an elaborate estimate of his resources, he had come to the conclusion to select that sum which represented the amount with compound interest to two years, fifteen calendar months, and fourteen days, from that date.
There are no more uses of "compound interest" in the book.
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The power of compound interest over long periods of time is not intuitive.
At the end of ten years they had paid everything, everything, with the rates of usury and the accumulations of the compound interest.