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Suppose that from given statistics, it is known that meningitis causes stiff neck 50% of the time, that the proportion of persons having meningitis is $\frac{1}{50000}$, and that the proportion od people having stiff neck is $\frac{1}{20}$. Then the percentage of people who had meningtis and complain about stiff neck is:

- 0.01%
- 0.02%
- 0.04%
- 0.05%