Margin = $360,000 / $3,600,000 = 0.1 or 10%
Turnover = $3,600,000 / $1,440,000 = 2.5
ROI = 0.1 × 2.5 = 0.25 or 25% OR $360,000 × $1,440,000
Margin = $560,000 / $7,000,000 = 0.08 or 8%
Turnover = $7,000,000 / $2,800,000 = 2.5
ROI = 0.08 × 2.5 = 0.20 or 20% OR $560,000 / $2,800,000
ROI = ($360,000 + $560,000) / ($1,440,000 + $2,800,000) = 0.217 or 21.7%