Use the following information to answer question 4-5. Operating data of Peter Company for last year follows: Sales Stockholders' equity Return on investment Turnover Minimum required rate of return Total assets $900,000 $500,000 12% 1.5 10% $800,000 4. The average operating assets amounted to: A. $400,000 B. $500,000 C. $600,000 D. $800,000 5. The residual income amounted to: A. $10,000 B. $12,000 C. $18,000 D. $16,000