Answer:
1. Return on Investment = Sales Margin / Capital turnover
= (Net income / Sales) ÷ (Assets / Sales)
Osaka:
= (210,000 / 3,000,000) ÷ (1,000,000 / 3,000,000)
= 0.07 / 0.33
= 21%
Yokohama
= (720,000 / 9,000,000) ÷ (4,000,000 / 9,000,000)
= 0.08 / 0.44
= 18%
2. Residual income = Operating income * (Required return * Average operating assets)
Osaka = 210,000 - (15% * 1,000,000)
= $60,000
Yokohama = 720,000 - (15% * 4,000,000)
= $120,000
c. No is isn't because Residual income is not a good matric to use to compare companies or departments as it does not show the amount of assets used by the companies being compared.