On March 1st, Frank opens a brokerage account and sell shorts 200 shares of Doggie Treats Inc. at $60 per share. The initial margin requirement is 50%. a. What is the margin in Frank's account when he first sells the stock? (3 marks) b. The stock pays a cash dividend of S1 on March 28th, and the share price falls to $50 per share by the end of March, what is the remaining equity in his account? (6 marks) c. What is the monthly rate of return on his margined position