Please help questions 3-4 please

3) Use the information in the following table to compute each department's contribution to overhead (both in dollars and as a percent). Which department contributes the largest dollar amount to total overhead? Which contributes the highest percent (as a percent of sales)? $ $ Sales Cost of goods sold Gross profit Total direct expenses Contribution to overhead Contribution percent Dept. A $ 106,000 68,370 37,630 6,890 Dept. B 360,000 207,400 152,600 74,120 Dept. c 168,000 99,120 68,880 15,120 4) Compute return on assets for each of these Best Buy divisions (each is an investment center). Comment on the relative performance of each investment center. Net Income Average Assets Return on Assets Cameras and camcorders $4,500,000 $ 20,000,000 $ 23 Phones and communications 1,500,000 12,500,000 Computers and accessories 800,000 10,000,000