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'.
Q: Problem: a shopkeeper sold 30 articles at the cost price of 35 articles . then find the profit % or lost % 
Options: a ) 12 % , b ) 15 % , c ) 16.67 % , d ) 18 % , e ) 22 %
A:

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
c