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.

[EX Q]: Question: A started a business with an investment of Rs. 70000 and after 3 months B joined him investing Rs. 120000. If the profit at the end of a year is Rs. 43000, then the share of B is?

 Option A: 33888

 Option B: 36000

 Option C: 27778

 Option D: 27772

 Option E: 81122
[EX A]: Option B

[EX Q]: Question: The parameter of a square is double the perimeter of a rectangle. The area of the rectangle is 480 sq cm. Find the area of the square?

 Option A: 482

 Option B: 268

 Option C: 260

 Option D: 480

 Option E: 632
[EX A]: Option D

[EX Q]: Question: The true discount on Rs.1600 due to after a certain of 5% per annum is Rs.160. The time after which it is due is

 Option A: 27months

 Option B: 23months

 Option C: 20months

 Option D: 12months

 Option E: None of these
[EX A]:
Option A