In this task, you need to answer the given multiple-choice question on the general math. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

Example Input: Problem: how many even 4 - digit numbers can be formed , so that the numbers are divisible by 4 and no two digits are repeated ?
Options: a ) 336 , b ) 784 , c ) 1120 , d ) 1804 , e ) 1936
Example Output: c

Example Input: Problem: the difference of two numbers is 11 and one - fifth of their sum is 9 . find the numbers .
Options: a ) 28 and 17 , b ) 27 and 18 , c ) 25 and 15 , d ) 27 and 15 , e ) 25 and 18
Example Output: a

Example Input: Problem: the equal amounts of money are deposited in two banks each at 15 % per annum for 3.5 years and 5 years respectively . if the difference between their interests is rs . 144 , find the each sum ?
Options: a ) 640 , b ) 500 , c ) 3000 , d ) 1000 , e ) 2000
Example Output:
a