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: a rope of which a calf is tied is increased from 12 m to 23 m, how much additional grassy ground shall it graze ?
Options: a. 2989, b. 2789, c. 1210, d. 1288, e. 1211

SOLUTION: c

PROBLEM: Problem: how much is 60 % of 40 is greater than 4 / 5 of 30 ?
Options: a. 8, b. 3, c. 7, d. 0, e. 1

SOLUTION: d

PROBLEM: Problem: the price of stock decreased by 5 % last year and rose by 10 % this year. what is the net percentage change in the price of the stock ?
Options: a. 0.2 %, b. 0.8 %, c. 1.2 %, d. 1.6 %, e. 4.5 %

SOLUTION:
e