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.

[Q]: Problem: an 80 - liter solution of cool - drink is made from 10 % jasmine water. if 5 liters of jasmine and 15 liters of water were added to the solution, what percent of the solution is jasmine ?
Options: a. 11 %, b. 13 %, c. 15 %, d. 17 %, e. 19 %
[A]: b


[Q]: Problem: a ( 3, w ^ 3 ) is the ( x, y ) coordinate of point located on the parabola y = x ^ 2 - 1. what is the value of w ?
Options: a. 2., b. 4., c. 5., d. 6., e. 9.
[A]: a


[Q]: Problem: each month a retailer sells 100 identical items. on each item he makes a profit of $ 60 that constitutes 10 % of the item ' s price to the retailer. if the retailer contemplates giving a 5 % discount on the items he sells, what is the least number of items he will have to sell each month to justify the policy of the discount ?
Options: a. 191, b. 213, c. 221, d. 223, e. 226
[A]:
d