i need to see it worked out please

The following information is provided about a division for the year 2019: Sales $500,000 Variable expenses $390,000 Contribution margin $110,000 Fixed expenses $70,000 Operating income $40,000 Required rate of return 10% Assets at 1/1/2019 $150,000 Assets at 12/31/2019 $170,000 Problem 1 (8 points): What is the division's margin? Problem 2 (8 points): What is the division's asset turnover? Problem 3 (8 points): What is the division's return on investment? Problem 4 (8 points): What is the division's residual income