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'.

[EX 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
[EX A]: a

[EX Q]: Problem: a bowl of fruit contains 14 apples and 20 oranges . how many oranges must be removed so that 70 % of the pieces of fruit in the bowl will be apples ? 
Options: a ) 3 , b ) 6 , c ) 14 , d ) 17 , e ) 20
[EX A]: c

[EX Q]: Problem: the sale price of an article including the sales tax is rs . 616 . the rate of sales tax is 10 % . if the shopkeeper has made a profit of 12 % , then the cost price of the article is ? 
Options: a ) 500 , b ) 277 , c ) 266 , d ) 188 , e ) 123
[EX A]:
a