Word Table formula

[Red]

I am trying to subtract the value in B10 From B11 and and then divide the
result by 12 and record in B12 using the following formula entered in
B121 but end up with syntax errors or the wrong result.

=SUM (B11) - sum (B10) /12

Can any-one assist?

 

[Gilles Desjardins]

Insert, Field, Formula, enter the following formula:
=(B11-B10)/12
HTH
Gilles