A private not-for-profit health care entity has the following account balances:

Revenue from newsstand . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         $ 50,000
Amounts charged to patients . . . . . . . . . . . . . . . . . . . . . . . . . .          800,000
Interest income . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           30,000
Salary expense—nurses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .          100,000
Provision for bad debts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .            10,000
Undesignated gifts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .            80,000
Contractual adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           110,000

What is reported as the organization’s net patient service revenue?
a. $880,000
b. $800,000
c. $690,000
d. $680,000