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: walking 7 / 6 of his usual rate , a boy reaches his school 3 min early . find his usual time to reach the school ? 
Options: a ) 21 , b ) 28 , c ) 99 , d ) 77 , e ) 66
[A]: a


[Q]: Problem: a watch was sold at a loss of 10 % . if it was sold for rs . 168 more , there would have been a gain of 4 % . what is the cost price ? 
Options: a ) s : 1000 , b ) s : 1067 , c ) s : 1200 , d ) s : 1028 , e ) s : 1027
[A]: c


[Q]: Problem: a shopkeeper buys two articles for rs . 1000 each and then sells them , making 30 % profit on the first article and 30 % loss on second article . find the net profit or loss percent ? 
Options: a ) 200 , b ) 278 , c ) 282 , d ) 202 , e ) 300
[A]:
e