What is the expected ROI $(1)$ if variable selling and administrative expenses are decreased by $6\%($please solve for and provide expected ROI$\%$ if expenses are decreased by $6\%),(2)$average operating assets are decreased by $20\mathrm{.}0\%($please solve for and provide expected ROI$\%$ if average operating assets are decreased by $20\mathrm{.}0\%),(3)$ and sales are increased by $$200,000$and this increase is expected to increase contribution margin by $$86,000($please solve for and provide expected ROI$\%$ if sales are increased by $$200,000$and this increase is expected to increase contribution margin by $$86,000)?$ Please help me learn to solve for this final question I am stuck on$.$ Your help will be greatly appreciated and I will up vote if you provide how to solve for the $3$ ROI$\%$ given the above changes.