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: The compound ratio of 1:3, 3:2 and 4:5?

 Option A: 1:9

 Option B: 1:7

 Option C: 1:2

 Option D: 2:5

 Option E: 1:4
[EX A]: Option D

[EX Q]: Question: Simran started a software business by investing Rs. 50,000. After six months, Nanda joined her with a capital of Rs. 80,000. After 3 years, they earned a profit of Rs. 24,500. What was Simran's share in the profit?

 Option A: 2777

 Option B: 2999

 Option C: 2799

 Option D: 2781

 Option E: 10500
[EX A]: Option E

[EX Q]: Question: A sum of money at simple interest amounts to Rs. 2240 in 2 years and to Rs. 2600 in 5 years. What is the principal amount

 Option A: 1000

 Option B: 1500

 Option C: 2000

 Option D: 2500

 Option E: 3500
[EX A]:
Option C