> The "method" uses the classic "rule of 72" - here modified to 'rule of 70'
> :-).

Maybe I'm thinking of a different "rule of 70", the one used to
calculate how long it will take for a given amount of initial
investment to double at a fixed interest rate? In that case, it's the
rule of 70 because ln(2) = .69... , so I'm not sure where the Rule of
72 is coming from here.
- Marcel
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