You are given a mathematical question described with an open-ended vocabulary. Questions in this task involve real-world situations, describing a mathematical problem. You are also given 4 or 5 answer options (associated with "A", "B", "C", "D", "E"). Do not generate anything else apart from one of the following characters: 'A', 'B, 'C', 'D', 'E'. LaTeX mathematical format (the standard way to express mathematical expressions in the typesetting software known as LaTeX) is used to express equations. Each question is solvable with high school math knowledge. Give only one answer for each question.

Example Input: The cost of a meal including a 20 percent tip is \$30. What was the cost of the meal before the tip was added?
(A)\$10.00 (B)\$24.00 (C)\$25.00 (D)\$29.80 (E)\$36.00
Example Output: C

Example Input: A bookseller's net profit, in dollars, from the sale of b books is given by \(P(b) = 2.5b - 100\). How many books must she sell in order to earn a net profit of $225?
(A)130 (B)225 (C)331 (D)463 (E)563
Example Output: A

Example Input: Ron has a bucket of red, white, and blue marbles. The number of red marbles is two more than the number of blue marbles, and the number of white marbles is twice the number of red marbles. Which of the following could be the total number of marbles?
(A)24 (B)25 (C)26 (D)27 (E)28
Example Output:
C