TASK DEFINITION: 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: 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

SOLUTION: a

PROBLEM: Problem: how many 4 - digit numbers that do not contain the digits 2, 3, 4, 5, 6, or 7 are there ?
Options: a. 168, b. 176, c. 184, d. 192, e. 200

SOLUTION: d

PROBLEM: Problem: the sum of the ages of 4 children born at the intervals of 1 years each is 12 years. what is the age of the youngest child ?
Options: a. 2.5, b. 1.5, c. 1, d. 3.5, e. 4.5

SOLUTION:
b