Answer:
The percentage, P, of these operations succeed and are free from infection is 83.57%.
Explanation:
Suppose John has a tendon surgery to repair it.
The risks to John:
Infection occurs after the operation in 3% of cases, the repair operation fails in 14% of cases, and both infection and failure of operation occur together in 0.57% of cases.
Therefore, chances of infection or chances of failure of operation or chances of both the cases will be (14 + 3 - 0.57) % = 16.43%.
Hence, the percentage, P, of these operations succeed without infection is (100 - 16.43) % = 83.57%. (Answer)