A study reported on 50 cases admitted for thyroid cancer and 100 controls admitted during the same time period for treatment of hernias. As ascertained through in-person interviews and a review of medical records, 20 of the cases were found to have been exposed to x-ray therapy in the past. The controls were not interviewed, but a review of their medical records revealed that only 2 controls had been exposed to x-ray therapy in the past.

Calculate the odds ratio for thyroid cancer among those exposed and not exposed to x-ray therapy.

Do not round intermediate calculations. Round your final answer to 2 decimal points