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 person incurs a loss of 5 % be selling a watch for rs. 1140. at what price should the watch be sold to earn 5 % profit
Options: a. rs. 1200, b. rs. 1230, c. rs. 1260, d. rs. 1290, e. none of these
[EX A]: c

[EX Q]: Problem: a bag has 9 green balls and 23 pink balls. how many green balls should be added to the bag so that the ratio of green balls and pink balls in the bag becomes 1: 1 ?
Options: a. 10, b. 11, c. 12, d. 13, e. 14
[EX A]: e

[EX Q]: Problem: a building contractor employs 20 male, 15 female and 5 child workers. to a male worker he pays rs. 25 per day, to a female worker rs. 20 per day and a child worker rs. 8 per day. the average wage per day paid by the contractor is ?
Options: a. 19, b. 21, c. 23, d. 25, e. 27
[EX A]:
b