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'.

Input: Consider Input: Problem: what is the value of â ˆ š 81 % ? 
Options: a ) 25 % , b ) 36 % , c ) 42 % , d ) 60 % , e ) 90 %

Output: e


Input: Consider Input: Problem: one night 17 percent of the female officers on a police force were on duty . if 170 police officers were on duty that night and half of these were female officers , how many female officers were on the police force ? 
Options: a ) 400 , b ) 420 , c ) 450 , d ) 480 , e ) 500

Output: e


Input: Consider Input: Problem: a solution contains 8 parts of water for every 7 parts of lemonade syrup . how many parts of the solution should be removed and replaced with water so that the solution will now contain 40 % lemonade syrup ? 
Options: a ) 1.5 , b ) 1.75 , c ) 2.14 , d ) 2.34 , e ) 2.64


Output: c