I PLS Zen, Inc., has a beta of 1.3 and is trying to calculate its cost of equity capital. If the risk-free rate of return is 8 percent and the expected return on the market is 12 percent, then what is the firm's after-tax cost of equity capital if the firm's marginal tax rate is 30 percent? 15.57% 7.92% 13.20% 23.60%