An investor purchases 400 shares of Company A at $55 per share. Suppose that the investor finances $8,500 of their investment with a margin loan at 7% interest. If the price of one share of Company A falls to $50 in a year, what is the investors rate of return? (Do not round intermediate calculations. Negative values should be indicated by a minus sign. Round your answer to 2 decimal places.)

Rate of Return %