You will be given a definition of a task first, then some input of the task.
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: huey ' s hip pizza sells two sizes of square pizzas: a small pizza that measures 12 inches on a side and costs $ 10, and a large pizza that measures 18 inches on a side and costs $ 20. if two friends go to huey ' s with $ 30 apiece, how many more square inches of pizza can they buy if they pool their money than if they each purchase pizza alone ?
Options: a. 5 square inches, b. 36 square inches, c. 15 square inches, d. 25 square inches, e. 350 square inches
Output:
b