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: a soccer team played 280 games and won 65 percent of them. how many games did it win ?
Options: a. 182, b. 100, c. 104, d. 150, e. 124
a

Problem: what is the units digit of ( 3 ^ 13 ) ( 4 ^ 13 ) ?
Options: a. 2, b. 4, c. 6, d. 7, e. 8
a

Problem: when the price of a product was decreased by 20 %, the number sold increased by 60 %. what was the effect on the total revenue ?
Options: a. 28 %, b. 32 %, c. 35 %, d. 45 %, e. 52 %

a