RE: eval divide and drop decimals.

You're certainly right, Rich.  I'm pretty sure there was no requirement for
func(-x) = -func(x).  By their nature, step functions in particular tend to
not have this property.

To have the function be reflective over the zero point, you'd need to use
the absolute function, I think:

   %abs(amt)/amt * %int((%abs(amt) + (increment - delta)) / increment)

But this is probably where I'd draw the line and use the IF statement.  The
function wasn't intended for negative numbers and a credit is really just
the negative of the fee calculated, so the right way from a business
standpoint is to do as you say and calculate the fee and multiple by -1.

Joe 



> From: Rich Duzenbury
> 
> Careful, this won't work with negative numbers.  If you need to credit
> the fee, do not send in -500.  Instead, calculate the fee as a positive
> number, then multiply it by -1.