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: fox jeans regularly sell for $ 10 a pair and pony jeans regularly sell for $ 18 a pair . during a sale these regular unit prices are discounted at different rates so that a total of $ 9 is saved by purchasing 5 pairs of jeans : 3 pairs of fox jeans and 2 pairs of pony jeans . if the sum of the two discounts rates is 22 percent , what is the discount rate on pony jeans ? 
Options: a ) 9 % , b ) 10 % , c ) 11 % , d ) 12 % , e ) 40 %
Example Output: e

Example Input: Problem: evaluate : 28 % of 400 + 45 % of 250 
Options: a ) 220.3 , b ) 224.5 , c ) 190.3 , d ) 150 , e ) none of these
Example Output: b

Example Input: Problem: if a man lost 4 % by selling oranges at the rate of 36 a rupee at how many a rupee must he sell them to gain 44 % ? 
Options: a ) 1 , b ) 8 , c ) 9 , d ) 24 , e ) 3
Example Output:
d