why do I need to deduct 140,000 what is that?

Jordan an auditor, is performing a routine review of a not-for-profit hospital and noted the following account balances in the statement of operations for the fiscal year ending Sept. 30, 2011: Gross patient service revenue from all $ 4,450,000 services at the hospital's established billing rate Bad debt expense $ 90,000 Contractual adjustments $ 420,000 Calculate the amount the hospital would report as net patient service revenue in its statement of operations for the fiscal year ending Sept. 30, 2011. Answer Gross patient service Bad debts Less: Contractual adjustments Net revenue 4450000 90000 4360000 280000 4080000