X Your answer is incorrect. Presented below is information related to the Southern Division of Lumber, Inc. Contribution m. Controllable margin $1,229,800 $1,008,250 Average operating assets $4,033,000 Minimum rate of return 20 % Compute the Southern Division's return on investment and residual income. Return on investment 0.25 24 Residual income 423200 eTextbook and Media