Christopher bought 100 shares of a stock for $30 per share on 70% margin. Assume he holds the stock for one year and that his interest costs will be $50 over the holding period. Ignoring commissions, what is his percentage return on invested capital if the stock price went up 10%? Group of answer choices: A) 13.44% B) 10.00% C) 11.90% D) 15.50%