At the opening of a trading day at a certain stock exchange, the price per share of stock K was $8. If the price per share of stock K was $9 at the closing of the day, what was the percent increase in the price per share of stock K for that day?	Pick
A) 1.4 %	B) 5.9 %	C) 11.1 %	D) 12.5 %	E) 23.6 %

Rationale: "opening = 8 closing = 9 rise in price = 1 so , percent increase = 18 ∗ 10018 ∗ 100 = > 12.50 % thus answer will be ( d )"
Answer: D