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.

Q: Problem: the present population of a town is 2000. population increase rate is 20 % p. a. find the population of town after 1 years ?
Options: a. 1000, b. 2400, c. 1500, d. 1600, e. 1250

A: b
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Q: Problem: a batsman makes a score of 87 runs in the 17 th inning and thus increases his average by 3. find his average after 17 th inning.
Options: a. 39, b. 88, c. 26, d. 87, e. 11

A: a
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Q: Problem: an investment yields an interest payment of $ 228 each month. if the simple annual interest rate is 9 %, what is the amount of the investment ?
Options: a. $ 28,300, b. $ 30,400, c. $ 31,300, d. $ 32,500, e. $ 35,100

A:
b
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