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'.

Problem: what percent of 12.4 kg is 20 gms ? 
Options: a ) 25 , b ) 16 , c ) 18 , d ) 19 , e ) 17
b

Problem: a watch was sold at a loss of 21 % . if it was sold for rs . 140 more , there would have been a gain of 4 % . what is the cost price ? 
Options: a ) 560 , b ) 882 , c ) 799 , d ) 778 , e ) 901
a

Problem: the banker ' s gain on a bill due due 1 year hence at 12 % per annum is rs . 8.4 . the true discount is 
Options: a ) rs . 70 , b ) rs . 36 , c ) rs . 54 , d ) rs . 50 , e ) none

a