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: a distributor sells a product through an online store , which take a commission of 20 % of the price set by the distributor . the distributor obtains the product from a producer at the price of $ 18 per item . what is the price that the buyer observers online if the distributor wants to maintain a 20 % profit on the cost of the item ? 
Options: a ) $ 25 , b ) $ 26 , c ) $ 27 , d ) $ 28 , e ) $ 29
Example Output: c

Example Input: Problem: calculate the dividend from caleb ' s stock , if caleb he invested rs . 2500 at 79 to obtain an income of rs . 200 . 
Options: a ) 6.32 , b ) 5.32 , c ) 7.32 , d ) 2.32 , e ) 1.32
Example Output: a

Example Input: Problem: a 7 % stock yields 10 % . the market value of the stock is : 
Options: a ) rs 60 , b ) rs 70 , c ) rs 90 , d ) rs 75 , e ) rs 50
Example Output:
b