Chang corp. has $375,000 of assets, and it uses only common equity capital (zero debt). its sales for the last year were $550,000, 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%. what profit margin would the firm need in order to achieve the 15% roe, holding everything else constant? do not round your intermediate calculations.