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: 30 is what percent of 100 ?
Options: a ) 35 % , b ) 30 % , c ) 45 % , d ) 50 % , e ) 55 %

SOLUTION: b

PROBLEM: Problem: a baseball card decreased in value 10 % in its first year and 10 % in its second year . what was the total percent decrease of the card ' s value over the two years ?
Options: a ) 19 % , b ) 30 % , c ) 32 % , d ) 36 % , e ) 72 %

SOLUTION: a

PROBLEM: Problem: the salary of a worker is first increased by 20 % and afterwards reduced by 20 % . what is the net change in the worker ' s salary ?
Options: a ) 4 % decrease , b ) 8 % decrease , c ) 4 % increase , d ) 8 % increase , e ) no change

SOLUTION:
a