Suppose Hornsby Ltd. just issued a dividend of $2.54 per share on its common stock. The company paid dividends of $2.04, $2.11, $2.28, and $2.38 per share in the last four years. If the stock currently sells for $73, what is your best estimate of the company's cost of equity capital using arithmetic and geometric growth rates? Arithmetic dividend growth rate % Geometric dividend growth rate %