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.

[EX Q]: Problem: a and b started a business investing rs. 80,000 and rs 20,000 respectively. in what ratio the profit earned after 2 years be divided between a and b respectively ?
Options: a. 4: 1, b. 3: 2, c. 18: 20, d. 18: 4, e. 17: 4
[EX A]: a

[EX 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
[EX A]: a

[EX Q]: Problem: irin, ingrid and nell bake chocolate chip cookies in the ratio of 9.18: 5.17: 2.05. if altogether they baked a batch of 148 cookies, what percent of the cookies did ingrid bake ?
Options: a. 0.125 %, b. 1.25 %, c. 31.7 %, d. 125 %, e. 0.152 %
[EX A]:
c