instruction:
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.
question:
Problem: find the simple interest on rs. 72,000 at 16 2 / 3 % per year for 9 months.
Options: a. 7500, b. 6500, c. 9000, d. 9500, e. none of them
answer:
c


question:
Problem: if the price of a certain computer increased 30 percent from b dollars to 351 dollars, then 2 b =
Options: a. 540, b. 570, c. 619, d. 649, e. 700
answer:
a


question:
Problem: what is the rate percent when the simple interest on rs. 800 amount to rs. 160 in 5 years ?
Options: a. 5 %, b. 7 %, c. 9 %, d. 2 %, e. 4 %
answer:

e