If the value of PC is either 0 or blank (uninitialized), then you will have a division by zero, which is being shown in your app... If that's the case, then you will need to determine what you want the result to be. If you want a blank result, you can use an expression like the following:
// since there is no "else" argument, the result will be blank if PC is blank or zero
If (Not IsBlank(PC) And PC <> 0, (CM / PC) * 100)
Another approach would be to use the IfError function, which can "catch" an error and replace it with something else:
IfError( (CM/PC)*100, Blank() )
Or you can replace it with some other value (for example, 0):
IfError( (CM/PC)*100, 0 )
Hope this helps!
