The net income of George and Betty has been calculated to be $600.
This is the term that is used to describe a person's gross income minus all other expenses which are to be accounted for.
In other to solve for the net income, we have to first determine the pay that Betty and George have.
revenue = Gross income + interest income
= 8000 + 100
= 8100
Next we solve for the expenses
taxes withheld + insurance payments + housing + food + miscellaneous
= 2300 + 700 + 4500 + 800 + 400
= 8700
Net income = 8700 - 8100
= $600
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