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.
--------
Question: Problem: mr. loyd wants to fence his square shaped land of 120 sqft each side. if a pole is laid every 12 ft how many poles do he need ?
Options: a. 20, b. 30, c. 40, d. 50, e. 60

Answer: c


Question: Problem: if price of t. v set is reduced by 20 %, then its sale increases by 80 %, find net effect on sale value
Options: a. 44, b. 45, c. 46, d. 47, e. 48

Answer: a


Question: Problem: in a school with 5 classes, each class has 2 students less than the previous class. how many students are there in the largest class if the total number of students at school is 105 ?
Options: a. 24, b. 25, c. 26, d. 27, e. 28

Answer:
b