Windsor Mechanical Ltd's preferred shares have a par value of $50, a dividend rate of 6.3 percent, and trade at a price of $60. Sheridan Incs preferred shares have a par value of $60, have a dividend rate of 4.2 percent, and trade at a price of $40. Which company's preferred stock is riskier? (Round answers to 2 decimal places, e.g. 5.17%.) Required rate of return Windsor Mechanical Ltd. % Sheridan Inc. % vis the riskier preferred stock