To cover the initial margin requirement of 60%, you deposited funds after short-selling 170 shares of common stock at $52 per share.

a. What is your rate of return if you cover at $57, assuming no dividends and no addition or removal of funds from the account? (Negative value should be indicated by a minus sign. Round your answer to 1 decimal place.)

Rate of return %

b. At what price would you receive a margin call if the minimum margin requirement is 30%? (Round your answer to 2 decimal places. Omit $ sign in your response.)