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: radha bought a watch for rs . 144 and got a percentage of profit equal to the cost price of the watch . what is the cost price of the watch ? 
Options: a ) rs . 72 , b ) rs . 78 , c ) rs . 80 , d ) rs . 90 , e ) rs . 92
[A]: d


[Q]: Problem: a man walking at a rate of 15 km / hr crosses a bridge in 10 minutes . the length of the bridge is ? 
Options: a ) 500 m , b ) 1110 m , c ) 950 m , d ) 1000 m , e ) 1300 m
[A]: a


[Q]: Problem: if a book is sold at 8 % profit instead of 8 % loss , it would have brought rs 12 more . find out the cost price of the book 
Options: a ) rs 75 , b ) rs 72 , c ) rs 60 , d ) rs 70 , e ) rs 80
[A]:
a