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.
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Question: Problem: if each participant of a chess tournament plays exactly one game with each of the remaining participants, then 276 games will be played during the tournament. find the number of participants.
Options: a. 20, b. 22, c. 24, d. 26, e. 28

Answer: c

Question: Problem: what is the normal price of an article sold at $ 72 after two successive discounts of 10 % and 20 % ?
Options: a. $ 92, b. $ 96, c. $ 100, d. $ 104, e. $ 108

Answer: c

Question: Problem: a bakery has 6 employees. it pays annual salaries of $ 19,000 to each of 2 employees, $ 21,000 to 1 employee, and $ 22,000 to each of the remaining 3 employees. which number is closest to the average ( arithmetic mean ) annual salary of these employees ?
Options: a. $ 20,200, b. $ 20,500, c. $ 20,800, d. $ 21,000, e. $ 21,400

Answer:
c