In this task, you need to answer the given multiple-choice question on the gain. Gain is the value by which to multiply the input. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

[EX Q]: Problem: in a certain parking lot , 2 % of the cars are towed for parking illegally . however 80 % of the cars which are parked illegally are not towed . what percentage of cars in the parking lot are parked illegally ? 
Options: a ) 4 % , b ) 6 % , c ) 8 % , d ) 10 % , e ) 12 %
[EX A]: d

[EX Q]: Problem: find the simple interest on rs . 350 for 10 months at 5 paisa per month ? 
Options: a ) 277 , b ) 175 , c ) 288 , d ) 266 , e ) 121
[EX A]: b

[EX Q]: Problem: the purchase price of an article is $ 48 . in order to include 10 % of cost for overhead and to provide $ 12 of net profit , the markup should be 
Options: a ) 15 % , b ) 25 % , c ) 35 % , d ) 40 % , e ) 45 %
[EX A]:
c