Definition: 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'.
Input: Problem: what percent is 25 gm of 1 kg ? 
Options: a ) 0.5 % , b ) 1 % , c ) 1.5 % , d ) 2.5 % , e ) 3 %
Output:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
d