@ snb,

?

It has one more formula and is more verbose. That is why I credited all here. I was standing on your shoulders, propped up by many others.

I am not clear yet on the difference in Precision/Accuracy between the Variant Type and the Decimal Type, but the reading I've done hints that the use of Decimal Types is preferred.

On the three files available, use of the Variant Type gave the same results as when using Doubles.