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.

Problem: the purchase price of an article is $ 48. in order to include 5 % of cost for overhead and to provide $ 12 of net profit, the markup should be
Options: a. 15 %, b. 25 %, c. 30 %, d. 40 %, e. 45 %
c

Problem: a fort had provision of food for 150 men for 45 days. after 15 days, 10 men left the fort. the number of days for which the remaining food will last, is :
Options: a. 32, b. 37 1 / 4, c. 42, d. 54, e. 45
a

Problem: a, b and c play a cricket match. the ratio of the runs scored by them in the match is a: b = 2: 3 and b: c = 2: 5. if the total runs scored by all of them are 100, the runs scored by b are ?
Options: a. 24, b. 18, c. 13, d. 17, e. 12

a