The task is to generate the correct answer for a given math problem.

[Q]: Problem: by selling an article for $ 195 , a person gains $ 45 . what is the gain % ?
[A]: 30 %


[Q]: Problem: in a circuit board factory , all circuit boards that pass a verification process are certified . every board that fails the verification process is indeed faulty , but 1 / 8 of those that pass are also faulty . approximately how many faulty circuit boards exist in a group of 3,200 circuit boards where 64 fail inspection ?
[A]: 456


[Q]: Problem: in an examination , a student scores 4 marks for every correct answer and loses 1 mark for every wrong answer . if he attempts all 200 questions and secures 240 marks , the number of questions he attempts incorrectly , is :
[A]:
112