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 a sum of money doubles itself in 20 years at simple interest, the ratepercent per annum is
Options: a. 12, b. 12.5, c. 13, d. 5, e. 14

SOLUTION: d

PROBLEM: Problem: raman mixed 48 kg of butter at rs. 150 per kg with 36 kg butter at the rate of rs. 125 per kg. at what price per kg should he sell the mixture to make a profit of 40 % in the transaction ?
Options: a. 129, b. 287, c. 195, d. 188, e. 112

SOLUTION: c

PROBLEM: Problem: 3 positive integers a, b, and c are such that their average is 20 and a b c. if the median is ( a + 13 ), what is the least possible value of c ?
Options: a. 21, b. 22, c. 23, d. 24, e. 25

SOLUTION:
e