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'.

[Q]: Problem: a store ' s selling price of $ 2240 for a certain computer would yield a profit of 40 percent of the store ' s cost for the computer . what selling price would yield a profit of 60 percent of the computer ' s cost ?
Options: a ) $ 2400 , b ) $ 2464 , c ) $ 2560 , d ) $ 2732 , e ) $ 2800
[A]: c

[Q]: Problem: the difference between simple and compound interest on rs . 1600 for one year at 10 % per annum reckoned half - yearly is ?
Options: a ) 8 , b ) 3 , c ) 9 , d ) 4 , e ) 2
[A]: d

[Q]: Problem: two numbers are respectively 20 % and 50 % more than a third number . what percentage is the first of the second ?
Options: a ) 25 % , b ) 60 % , c ) 80 % , d ) 55 % , e ) 74 %
[A]:
c