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Magic Number, 72

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The 'Rule of 72' as it is also known is a handy way of calculating financial returns. We don't know when it was discovered; it is first mentioned in Venice in 1494. Wikipedia tells us that, "Extending the rule of 72 out further, other approximations can be determined for tripling and quadrupling. To estimate the time it would take to triple your money, one can use 114 instead of 72 and, for quadrupling, use 144".
Join me, John, on my "Isn't it amazing?" channel and, I hope, be astounded and amused.
This will be a fun ride and I shall post regularly.
I studied Modern History at Christ Church, Oxford, and worked for Margaret Thatcher in the Conservative Research Department.
My professional career has been as a writer and a broadcasting executive in BBC TV (I was Executive Producer and Writer of the series 'CIA'), Channel 4, TV 2 Denmark, TVI Portugal and TV 2 Norway.
My books:
“Ireland. An illustrated history”, Oxford University Press. ISBN 0-00-216294-6
“A short history of Ireland”, Cambridge University Press, 3rd edition, 2013. ISBN 978-1-107-00923-3
“The Agency: the rise and decline of the CIA”, Simon & Schuster. ISBN 0-340-41230-5
"Thatcher`s people. An insider`s account of the politics, the power and the personalities", Harper Collins. ISBN 0-00-215410-2
“CIA - A History”, BBC Books. ISBN 978-0563362500
Thank you for joining me!
Join me, John, on my "Isn't it amazing?" channel and, I hope, be astounded and amused.
This will be a fun ride and I shall post regularly.
I studied Modern History at Christ Church, Oxford, and worked for Margaret Thatcher in the Conservative Research Department.
My professional career has been as a writer and a broadcasting executive in BBC TV (I was Executive Producer and Writer of the series 'CIA'), Channel 4, TV 2 Denmark, TVI Portugal and TV 2 Norway.
My books:
“Ireland. An illustrated history”, Oxford University Press. ISBN 0-00-216294-6
“A short history of Ireland”, Cambridge University Press, 3rd edition, 2013. ISBN 978-1-107-00923-3
“The Agency: the rise and decline of the CIA”, Simon & Schuster. ISBN 0-340-41230-5
"Thatcher`s people. An insider`s account of the politics, the power and the personalities", Harper Collins. ISBN 0-00-215410-2
“CIA - A History”, BBC Books. ISBN 978-0563362500
Thank you for joining me!
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