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.

Q: Question: A businessman earns $28800 in December, thus decreasing his average annual (January to December) earnings by $1300. His average annual earnings would be
Source: CMAT Preparation

 Option A: $29000

 Option B: $33500

 Option C: $40200

 Option D: $41000

 Option E: $43100

A: Option E
****
Q: Question: A father was as old as his son's present at the time of your birth. If the father's age is 44 years now, the son's age 5years back was?

 Option A: 10 years

 Option B: 12 years

 Option C: 14 years

 Option D: 16 years

 Option E: 17 years

A: Option E
****
Q: Question: Aish started a business investing Rs. 25,000 in 2010, In 2011, he invested an additional amount of Rs. 10,000 and Roshan joined him with an amount of Rs. 35,000. In 2012, Aish invested another additional amount of Rs. 10,000 and Atul joined them with an amount of Rs. 35,000. What will be Roshan’s share in the profit of Rs. 2,10,000 earned at the end of 3 years from the start of the business in 2010?

 Option A: Rs.45000

 Option B: Rs.50000

 Option C: Rs.60000

 Option D: Rs.70000

 Option E: None of these

A:
Option D
****
