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: i bought two books ; for rs . 600 . i sold one at a loss of 15 % and other at a gain of 19 % and then i found each book was sold at the same price . find the cost of the book sold at a loss ? 
Options: a ) 197 , b ) 280 , c ) 189 , d ) 278 , e ) 350

A: e
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Q: Problem: if price of t . v set is reduced by 10 % , then its sale increases by 85 % , find net effect on sale value 
Options: a ) 44 , b ) 45 , c ) 46 , d ) 67 , e ) 48

A: d
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Q: Problem: calculate how many seconds it will take for 4 bells to toll together again , given that they begin to toll together respectively at the intervals of 5 , 6 , 10 and 12 seconds . ? 
Options: a ) 61 , b ) 60 , c ) 79 , d ) 70 , e ) 78

A:
b
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