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: in a restaurant , the profit is 120 % of the cost . if the cost increases by 12 % but the selling price remains constant , approximately what percentage of the selling price is the profit ? 
Options: a ) 30 % , b ) 49 % , c ) 90 % , d ) 100 % , e ) none of these

A: b
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Q: Problem: what is the value of â ˆ š 81 % ? 
Options: a ) 25 % , b ) 36 % , c ) 42 % , d ) 60 % , e ) 90 %

A: e
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Q: Problem: find the simple interest on rs . 71,000 at 16 2 / 3 % per year for 9 months . 
Options: a ) 7500 , b ) 6500 , c ) 8875 , d ) 9500 , e ) none of them

A:
c
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