ABC and BCD Joint Corporation is a division of a major corporation. Last year the division had total sales of SAR $85,780,000,$ net operating income of SAR $8,697,570,$ and average operating assets of SAR $11,000,000.$ The company's minimum required rate of return is $15\%.$

Required:

a$.$ What is the division's margin?

b$.$ What is the division's turnover?

c$.$ What is the division's return on investment $($ROI$)?$