Ignoring income taxes, the annual net income amount used to calculate the Accounting Rate of Return is Average Annual Profit / Average Investment.
The Accounting Rate of Return (ARR) is the average net income which an asset is expected to generate divided by its average capital cost, and thus it is expressed as an annual percentage.
The ARR's formula is used to make capital budgeting decisions. It is used in situations where companies are deciding on whether or not to invest in an asset based on its expected future net earnings.
Hence, the Accounting Rate of Return is calculated by Average Annual Profit / Average Investment.
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