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: what annual installment will discharge a debt of rs . 1092 due in 3 years at 12 % simple interest ? 
Options: a ) 442 , b ) 441 , c ) 440 , d ) 320 , e ) 532
Example Output: a

Example Input: Problem: a 4 % stock yield 5 % . the market value of the stock is ? 
Options: a ) rs . 125 , b ) rs . 80 , c ) rs . 99 , d ) rs . 109 , e ) rs . 101
Example Output: b

Example Input: Problem: at what rate percent on simple interest will rs . 850 amount to rs . 950 in 5 years ? 
Options: a ) 2.35 % , b ) 5.95 % , c ) 4.35 % , d ) 5.33 % , e ) 6.33 %
Example Output:
a