**Date:** Tue, 26 Nov 2002 21:53:24 -0800

**Author:** Duncan Poland

**Subject:** Re: mental gymnastics

**Post:**

> >And a 14.8% growth rate per year doubles your money in 5 years.

>(7.3% is need for a 5 year doubling.)This has been my target for my

>mutual fund investments. These days, I am happy to avoid a -14.8%

>return/year.

I think that the atomic fine structure constant 1/137 is intended.

It is a pure number, commonly designated with the Greek letter alpha.

Hence, A?

> Duncan

>lo A few have stumped me:

> >

>> 70/PGR = DT

>

>Probably 70 divided by the percentage growth rate equals the

>doubling time. E.g. 7% interest rate doubles your money in 10 years.

>

>> 1/127 = A

>

>This seems very familiar!

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