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.

Ex Input:
Problem: lloyd normally works 7.5 hours per day and earns $ 3.50 per hour. for each hour he works in excess of 7.5 hours on a given day, he is paid 1.5 times his regular rate. if lloyd works 10.5 hours on a given day, how much does he earn for that day ?
Options: a. $ 33.75, b. $ 42.00, c. $ 51.75, d. $ 54.00, e. $ 70.00

Ex Output:
b


Ex Input:
Problem: evaluate: 98612 / 22 * 11 * 70 = ?
Options: a. 700.4, b. 704.4, c. 740.4, d. 744.4, e. 700.0

Ex Output:
b


Ex Input:
Problem: a alone can do a piece of work in 6 days and b alone in 8 days. a and b undertook to do it for rs. 3200. with the help of c, they completed the work in 3 days. how much is to be paid to c
Options: a. rs. 300, b. rs. 400, c. rs. 500, d. rs. 600, e. none of these

Ex Output:

b