For example , if one parent earns $30,000 per year .
The other earns $20,000 , the first parent would have to pay 60 % of an extraordinary expense and the other would have to pay 40 % .
For example , if one parent earns $30,000 per year and the other earns $20,000 , the first parent would have to pay 60 % of an extraordinary expense and the other would have to pay 40 % .