While discussing Disability Insurance with an Insurance agent, John and Paul are learning about some of the options under the plan. It is explained that if they are not totally disabled under the plan's definition that there are options for both partial and residual disability benefits. When considering residual disability benefits, If John and Paul had annual Incomes of $90,000, and they had $4,500 monthly disability benefits, how much would they receive in monthly disability benefits if they had a loss of income of $9,000 annually ?