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'.

Ex Input:
Problem: if a lends rs . 3500 to b at 10 % per annum and b lends the same sum to c at 12 % per annum then the gain of b in a period of 3 years is ? 
Options: a ) 200 , b ) 210 , c ) 220 , d ) 225 , e ) 230

Ex Output:
b


Ex Input:
Problem: if a radio is purchased for rs 490 and sold for rs 465.50 find the loss % ? 
Options: a ) 5 % , b ) 4 % , c ) 6 % , d ) 8 % , e ) 7 %

Ex Output:
a


Ex Input:
Problem: what will be the difference between simple and compound interest @ 10 % per annum on the sum of rs 1000 after 4 years 
Options: a ) rs 62.10 , b ) rs 63.10 , c ) rs 64.10 , d ) rs 65.10 , e ) none of these

Ex Output:

c