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 merchant marks goods up by 80 % and then offers a discount on the marked price. the profit that the merchant makes after offering the discount is 35 %. what % discount did the merchant offer ?
Options: a. 20 %, b. 25 %, c. 30 %, d. 35 %, e. 40 %
[EX A]: b

[EX Q]: Problem: on the independence day, bananas were be equally distributed among the children in a school so that each child would get two bananas. on the particular day 360 children were absent and as a result each child got two extra bananas. find the actual number of children in the school ?
Options: a. 237, b. 287, c. 197, d. 287, e. 720
[EX A]: e

[EX Q]: Problem: a and b started a business in partnership investing rs. 20000 and rs. 15000 respectively. after 6 months, c joined them with rs. 20000. what will be a ' s share in the total profit of rs. 27000 earned at the end of 2 years from the starting of the business ?
Options: a. rs. 7500, b. rs. 9000, c. rs. 9500, d. rs. 10,800, e. none
[EX A]:
d