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.

Let me give you an example: From a pack of 52 cards, two cards are drawn together at random. What is the probability of both the cards being kings? 

 Option A:2/1223 

 Option B: 1/122 

 Option C: 1/221 

 Option D: 3/1253 

 Option E: 2/153 


The answer to this example can be: Option C
Here is why: Let s be the sample space. 
 Then n(s) = 52C2 = 1326 
 E = event of getting 2 kings out of 4 
 n(E) = 4C2 = 6 
 P(E) = 6/1326 = 1/221

OK. solve this:
Question: The price of 10 chairs is equal to that of 4 tables. The price of 15 chairs and 2 tables together is Rs. 4000. The total price of 12 chairs and 3 tables is

 Option A: Rs. 3800

 Option B: Rs. 3900

 Option C: Rs. 4000

 Option D: Rs. 4200

 Option E: Rs. 4400
Answer:

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
Option B