Quick check on the arithmetic?
With continuous compounding, 1/2 = (1-2.6%)^n = 0.974^n n = log(1/2) / log(0.974) = 26.3 y
Same answer on a Deci-Lon.
With annual compounding, HP-12c gives 27y
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With continuous compounding, 1/2 = (1-2.6%)^n = 0.974^n n = log(1/2) / log(0.974) = 26.3 y
Same answer on a Deci-Lon.
With annual compounding, HP-12c gives 27y