Question $6($Mandatory$)(2$ points$)$

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Return on investment $($ROI$)$ is calculated using the formula

total costs $-$ total benefits$)\frac{?}{?}$ total benefits

ROI$=($total costs $-$ total benefits$)\frac{?}{?}$ total costs

total benefits $-$ total costs$)\frac{?}{?}$ total costs

ROI$=($total benefits $-$ total costs$)/$ total benefits