instruction:
The task is to generate the correct answer for a given math problem.
question:
Problem: by selling an article for $ 195 , a person gains $ 45 . what is the gain % ?
answer:
30 %


question:
Problem: a 9 % stock yields 8 % . the market value of the stock is :
answer:
rs . 112.50


question:
Problem: a train 120 m long is running at 60 kmph . in how much time will it pass a platform 240 m long ?
answer:

21.6 seconds