he Shrieves Corporation has $25,000 that it plans to invest in marketable securities. It is choosing among AT&T bonds, which yield 7%, state of Florida muni bonds, which yield 4.5% (but are not taxable), and AT&T preferred stock, with a dividend yield of 5.5%. Shrieves's corporate tax rate is 40%, and 70% of the dividends received are tax exempt. Find the after-tax rates of return on all three securities. Round your answers to two decimal places. A-T rate of return on AT&T bond % A-T rate of return on Florida muni bonds % A-T rate of return on AT&T preferred stock