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Suppose a US medical board is using marginal analysis to determine the optimal screening frequency for a specific disease. Below is the approximate number of early cases detected as you expand testing to a broader population. Suppose further that catching each early detection case is considered to have a benefit of $50,000 and the cost of screening one person is $5,000. Number of people screened Total Number of Early in a given year Detection Cases 10,000 2000 20,000 4000 30,000 5500 40,000 6500 50,000 7000 Using the marginal benefit/marginal cost rule, what is the optimal population for screening? O 40,000 X 30,000 20,000 O 50,000