Grace Company has paid increasing dividends of $0.54, $0.58, $0.62, $0.67, and $0.72 a share over the past five years, respectively. The firm estimates that future increases in their dividends will be comparable to the arithmetic average growth rate over these past five years. The stock is currently selling for $38.60 a share. The risk-free rate is 4% and the market risk premium is 8%. What is your best estimate of Grace's cost of equity if their beta is 1.22?