Your Company reported the following: Year 1 Year 2 Year 3 Year 4 Margin 4% 6% 5% 8% Turnover ? ? ? ? Average operating assets? ? ? ? Net operating income $15,000 $15,000 $15,000 $15,000 Sales ? ? ? ? ROI 20% 24% 15% 16% What were average operating assets for Year 12 $ 75,000 O $100,000 O $ 93.750 O $ 62,500