How is Medicare Part B financed?

		By a payroll tax on the working population, with the patient responsible for a deductible and copayment
		By a premium paid 75 percent by the aged and 25 percent by the government, with the patient responsible for a deductible and copayment
		By a premium paid 25 percent by the aged and 75 percent by the government, with the patient responsible for a deductible and copayment
		By a payroll tax on the working population and a federal subsidy, with the patient responsible for a deductible and copayment