Suppose that you just purchased 250 shares of Beta Banana's stock for $70 per share. The initial margin requirement is 60.0%, which means the amount borrowed is $7,000. The corresponding balance sheet is below: Required: a. Now suppose the price of the stock falls to $45 per share. What is your current margin percentage? (Round your answer to 2 decimal places.) b. Construct the balance sheet to show the current situation