Which of the following is not necessary in order for the corrective tax and pollution permit to have equivalent effects? a. pb must be equivalent to the corrective tax. b. qa must be equivalent to the amount of pollution allowed to the pollution permit holders. c. the equilibrium price and quantity of pollution must be the same in both graphs. d. the amount of pollution emitted by each firm must be the same.

Chang corp. has $375,000 of assets, and it uses only common equity capital (zero debt). its sales for the last year were $595,000, and its net income was $25,000. stockholders recently voted in a new management team that has promised to lower costs and get the return on equity up to 15.0%. what profit margin would the firm need in order to achieve the 15% roe, holding everything else constant? a. 9.45%b. 9.93%c. 10.42%d. 10.94%e. 11.49%