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

[Q]: Problem: a , b and c enter into partnership . a invests some money at the beginning , b invests double the amount after 6 months , and c invests thrice the amount after 8 months . if the annual gain be rs . 21000 . a ' s share is ?
Options: a ) 2999 , b ) 2778 , c ) 7000 , d ) 2889 , e ) 6612
[A]: c

[Q]: Problem: if an article is sold at 19 % profit instead of 12 % profit , then the profit would be rs . 105 more . what is the cost price ?
Options: a ) 1890 , b ) 2790 , c ) 1990 , d ) 1500 , e ) 1701
[A]:
c