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'.

Example Input: Problem: if 20 % of a number = 1000 , then 120 % of that number will be ? 
Options: a ) 20 , b ) 120 , c ) 360 , d ) 6000 , e ) 820
Example Output: d

Example Input: 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
Example Output: a

Example Input: Problem: at what price must an article costing rs . 47.50 be marked in order that after deducting 5 % from the list price . it may be sold at a profit of 40 % on the cost price ? 
Options: a ) 62.5 , b ) 69.5 , c ) 67.5 , d ) 62.5 , e ) 70
Example Output:
e