You are given a math word problem and you are supposed to make use of mathematical concepts like probability, combinatorics, linear equations, sequences/series, or simple operators like addition, subtraction, division, or multiplication to answer the given question. Choose the best option from the 5 given options and report that option.
--------
Question: Question: Ajay marked the price of his goods 30% more than his C.P. He then sells 1/4th of his stock at a discount of 15%, and half of the stock at the marked price, and the rest at a discount of 30%. Find his gain percentage.

Option A: 16.5%

Option B: 15.375%

Option C: 14.20%

Option D: 13.37%

Option E: None of these

Answer: Option B

Question: Question: In how many ways, a committee of 5 members can be selected from
6 men and 5 ladies, consisting of 3 men and 2 ladies?

Option A: 100

Option B: 200

Option C: 300

Option D: 400

Option E: 500

Answer: Option B

Question: Question: The average marks of a class of 25 students is 40 and that of another class of 30 students is 60. Find the average marks of all the students?

Option A: 52.6

Option B: 52.4

Option C: 52.1

Option D: 50.9

Option E: 52.9

Answer:
Option D