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: An article is bought for Rs.675 and sold for Rs.1215, find the gain percent?

Option A: 33 1/9%

Option B: 33 8/3%

Option C: 33 1/3%

Option D: 33 2/3%

Option E: 80%
[EX A]: Option E

[EX Q]: Question: Donald plans to invest x dollars in a savings account that pays interest at an annual rate of 8% compounded quarterly. Approximately what amount is the minimum that Donald will need to invest to earn over $100 in interest within 6 months?

Option A: 1500

Option B: 1750

Option C: 2000

Option D: 2500

Option E: 3000
[EX A]: Option D

[EX Q]: Question: By selling an article at Rs.700, a shopkeeper makes a profit of 25%. At what price should he sell the article so as to make a loss of 25%?

Option A: s.600

Option B: s.480

Option C: s.500

Option D: s.450

Option E: s.420
[EX A]:
Option E