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 man bought an article and sold it at a gain of 5 %. if he had bought it at 5 % less and sold it for re 5 less, he would have made a profit of 10 %. the c. p. of the article was
Options: a. 960, b. 980, c. 900, d. 970, e. 1000
e

Problem: find the sum of first 89 odd numbers
Options: a. 7921, b. 4800, c. 7900, d. 4980, e. 4960
a

Problem: at 1: 00 pm, a truck left city p and headed toward city q at a constant speed of 36 km / h. one hour later, a car left city q and headed toward city p along the same road at a constant speed of 48 km / h. if the distance between city p and city q is 330 km, at what time will the truck and the car meet each other ?
Options: a. 4: 30, b. 4: 45, c. 5: 00, d. 5: 15, e. 5: 30
e