Given a math problem with context and a question and 5 answer choices, the task is to provide the correct answer choice based on the problem. You must choose one of the given answer choices by letter: a, b, c, d, or e; anything else is invalid.

Problem: ravi purchased a refrigerator and a mobile phone for rs. 15000 and rs. 8000 respectively. he sold the refrigerator at a loss of 5 percent and the mobile phone at a profit of 10 percent. overall he make a.
Options: a. 50, b. 288, c. 27, d. 200, e. 881
a

Problem: 2,7, 17,3, 11,19, 5,13, __
Options: a. 20, b. 21, c. 22, d. 23, e. 24
d

Problem: a corporation that had $ 115.19 billion in profits for the year paid out $ 230.10 million in employee benefits. approximately what percent of the profits were the employee benefits ? ( note: 1 billion = 10 ^ 9 )
Options: a. 50 %, b. 20 %, c. 5 %, d. 2 %, e. 0.2 %

e