You purchase 550 shares of 2 nd Chance Co. stock on margin at a price of $55. Your broker requires you to deposit $15,500. a. Suppose you sell the stock at a price of $62. What is your return? What would your return have been had you purchased the stock without margin? (Do not round intermediate calculations. Enter your answers as a percent rounded to 2 decimal places.) b. What is your return if the stock price is $54 when you sell the stock? What would your return have been had you purchased the stock without margin? (A negative value should be indicated by a minus sign. Do not round intermediate calculations. Enter your answers as a percent rounded to 2 decimal places.)