When the Coronet Company formed three divisions a year ago, the president told the division managers that an annual bonus would be paid to the most profitable division. However, absolute division operating income as convention ally computed would not be used. Instead, the ranking would be affected by the relative investments in the three divisions. Options available include ROI and residual income.
Investment can be measured using gross book value or net book value. Each manager has now written a memorandum claiming entitlement to the bonus. The following data are available:

All the assets are fixed assets that were purchased ten years ago and have ten years of useful life remaining. A zero terminal disposal price is predicted. Coronet€™s required rate of return on investment used for computing residual income is 10% of investment.
REQUIRED
Which method for computing profitability did each manager choose? Make your description specific and brief. Show supporting computations. Where applicable, assume straight-line amortization.

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DivisionDvision Asets Gross Boolk Value of Division Assets Division Operating Income Mastex Banjo Randal $480,000 456,000 300,000 $$7,000 $5,200 36,960