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Andy Green is gearing up to break the land speed record in his rocket powered car Bloodhound SSC

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September 2009
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rule of 70

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Those who understand compound interest are destined to collect it. Those who don't are doomed to pay it - or so says a well-known source of financial advice. But what is compound interest, and why is it so important? John H. Webb explains.

Tags: compound interest : present value : future value : rule of 70 : logarithm : Maclaurin series : geometric series