Detailed Answer
Correct answer: (B)
In case of investigation, total costs will be equal to the sum of the cost of investigation itself ($6,000)
and the expected cost of correction ($18,000x), where ’x’ is the probability of improper operations. The
expected cost of not doing an investigation is $33,000x. Equating both sides would allow us to find x. So,
33,000x = 6,000 + 18,000x. Solving for x gives 0.4. This means that if the probability of an improper
operation is 40%, Bagley is indifferent as to whether or not he investigates.