Oldin Corporation currently pays its salesperson a flat salary of $5,000 per month and is considering paying $20 per unit instead. Sales are currently 200 units per month. Goldin believes the compensation change will increase unit sales by 25%. The current contribution margin is $80 per unit. If the change is implemented, net operating income will ______. Multiple choice question. Decrease by $4,000 increase by $4,000 increase by $1,000 decrease by $1,000