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'.

Problem: at an election 2 candidates are participated a candidate got 30 % of votes and defeated by 5000 votes . 100 votes are invalid . find the total polled votes ? 
Options: a ) 11520 , b ) 12600 , c ) 15000 , d ) 13560 , e ) 12560
b

Problem: in the manufacture of a certain product , 8 percent of the units produced are defective and 4 percent of the defective units are shipped for sale . what percent of the units produced are defective units that are shipped for sale ? 
Options: a ) 0.125 % , b ) 0.32 % , c ) 0.8 % , d ) 1.25 % , e ) 2.0 %
b

Problem: a tank contains 10,000 gallons of a solution that is 5 percent sodium chloride by volume . if 3,500 gallons of water evaporate from the tank , the remaining solution will be approximately what percent sodium chloride ? 
Options: a ) 6.43 % , b ) 6.89 % , c ) 7.69 % , d ) 8.21 % , e ) 8.75 %

c