Question 4 (1 point) A firm financed by 50m debt and 80m equity has fixed operating costs of 9m and variable operating costs of 15m. If the firm faces a marginal tax rate of 25% and its bottom-up beta is 1.5, the firm's pure business beta is closest to: OA) 0.38 B) 0.64 C) 0.43 D) 0.80