Some simple math computations

Here are a few simple math computations drawn from the Vermont divorce financial affidavit I'm working on.

To total some variables-- This one totals household expenses:
Total household affiant CO + Total vehicle affiant CO + Total insurance affiant CO + Total personal expenses affiant CO + Total monthly credit card affiant NU
Note that some of those are computational variables, so there are two layers of computation going on.

To subtract -- This one is for business income:
Bus monthly gross receipts NU - Total business expenses CO