Pardon me if I use the wrong words -- I'm a software guy, not a spreadsheet
guy. I am trying to write a function (macro?). Unfortunately, the function
is choking on Min(a,b). Here's an example:

(I invoke this by typing "=myfunc(+B12)" in a cell)

function myfunc(a as currency) as currency
Dim Result As Currency
Dim x As Currency

Result = 0

x = Min(100000, a) <== doesn't like this at run-time
Result = Result + x * 0.07
....
end function