TASK DEFINITION: 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: Problem: if a large pizza has a radius that is 10 % larger that that of a medium pizza , what is the percent increase in area between a medium and a large pizza ? 
Options: a ) 15 % , b ) 21 % , c ) 25 % , d ) 30 % , e ) 36 %

SOLUTION: b

PROBLEM: Problem: a trader bought a car at 20 % discount on its original price . he sold it at a 55 % increase on the price he bought it . what percent of profit did he make on the original price ? 
Options: a ) 17 % , b ) 24 % , c ) 12 % , d ) 82 % , e ) 16 %

SOLUTION: b

PROBLEM: Problem: a man gains 20 % by selling an article for a certain price . if the sells it at double the price , the percentage of profit will be 
Options: a ) 740 % , b ) 540 % , c ) 640 % , d ) 140 % , e ) 240 %

SOLUTION:
d