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Increase sales by $300,000 with no change in the contribution margin percentage: 25.8% Reducevariable costsby $160,000: 4.6% Reduce averageoperating assetsby 3%: 21.9%.To compute the ROI under each proposed course of action, we need to calculate the operating income and the average operating assets for each scenario. The ROI formula is:ROI = Operating Income / Average Operating AssetsLet's calculate the ROI under each course of action:Increase sales by $300,000 with no change in the contribution margin percentage:Operating Income= (Sales - Variable Costs) - Controllable Fixed Costs= ($3,000,000 + $300,000 - $2,010,000) - $605,000= $1,290,000Average Operating Assets remains the same at $5,000,000.ROI= $1,290,000 / $5,000,000= 0.258 or 25.8%Reduce variable costs by $160,000:Operating Income = (Sales - Variable Costs) - Controllable Fixed Costs= ($3,000,000 - $160,000 - $2,010,000) - $605,000= $230,000Average Operating Assets remains the same at $5,000,000.ROI = $230,000 / $5,000,000= 0.046 or 4.6%Reduce average operating assets by 3%:Operating Income remains the same at $1,060,000.Average Operating Assets = $5,000,000 - (3% * $5,000,000)= $5,000,000 - $150,000= $4,850,000ROI = $1,060,000 / $4,850,000= 0.219 or 21.9%So, the ROI under each proposed course of action is as follows:Increasesalesby $300,000 with no change in the contribution margin percentage: 25.8%Reduce variable costs by $160,000: 4.6%Reduce average operating assets by 3%: 21.9%Learn more aboutROIhere:brainly.com/question/30049040#SPJ11...