You are given a math word problem and you are supposed to make use of mathematical concepts like probability, combinatorics, linear equations, sequences/series, or simple operators like addition, subtraction, division, or multiplication to answer the given question. Choose the best option from the 5 given options and report that option.

Ex Input:
Question: A mall charges 50 cents for the first hour of parking and $4 for each additional hour until the customer reaches 4 hours, after that the parking fee is $2 per hour. If a Rahul parked his car in the mall for 7 hours and 30 minutes, how much is he going to pay?

Option A: $25

Option B: $12.

Option C: $23.5

Option D: $24.5.

Option E: $25.5

Ex Output:
Option A

Ex Input:
Question: The population of a certain town increases by 50 percent every 50 years. If the population in 1950 was 810, in what year was the population 160?

Option A: 1650

Option B: 1700

Option C: 1750

Option D: 1800

Option E: 1850

Ex Output:
Option C

Ex Input:
Question: An order was placed for the supply of a carpet whose breadth was 6 m and length was 1.44 times the breadth. What be the cost of a carpet whose length and breadth are 40% more and 25% more respectively than the first carpet. Given that the ratio of carpet is Rs. 45 per sq m?

Option A: Rs. 3642.40

Option B: Rs. 3868.80

Option C: Rs. 4216.20

Option D: Rs. 4082.40

Option E: None of these

Ex Output:
Option D