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 couple who own an appliance store discover that if they advertise a sales discount of 10 % on every item in the store, at the end of one month the number of total items sold increases 15 %. their gross income from sales for one month increases by what percent ?
Options: a. 1.5 %, b. 2.5 %, c. 3.5 %, d. 4.5 %, e. 5.5 %

SOLUTION: c

PROBLEM: Problem: find the cost of fencing around a circular field of diameter 32 m at the rate of rs. 2 a meter ?
Options: a. 201, b. 132, c. 772, d. 592, e. 261

SOLUTION: a

PROBLEM: Problem: 20 beavers, working together in a constant pace, can build a dam in 3 hours. how many hours c will it take 12 beavers that work at the same pace, to build the same dam ?
Options: a. 2., b. 4., c. c = 5., d. c = 6., e. 8.

SOLUTION:
c