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 dimensions of a room are 25 feet * 15 feet * 12 feet. what is the cost of white washing the four walls of the room at rs. 10 per square feet if there is one door of dimensions 6 feet * 3 feet and three windows of dimensions 4 feet * 3 feet each ?
Options: a. s. 9060, b. s. 4520, c. s. 4527, d. s. 4530, e. s. 4521

A: a
****
Q: Problem: a, b and c play a cricket match. the ratio of the runs scored by them in the match is a: b = 6: 3 and b: c = 6: 5. if the total runs scored by all of them are 118, the runs scored by b are ?
Options: a. 24, b. 20.13, c. 30.93, d. 20.93, e. 10.93

A: a
****
Q: Problem: the probability that a number selected at random from the first 50 natural numbers is a composite number is
Options: a. 17 / 26, b. 17 / 25, c. 17 / 20, d. 17 / 22, e. 17 / 21

A:
b
****