The average accounting return for mountain frost is 21.94%
The average annual return on an investment can be calculated by dividing the average lifetime revenues of a project by the average book value of the investment. For long-term stock market investments, the majority of investors would consider an average annual rate of return of 10% or above to be satisfactory. Just remember that it's only an average. There will be some years with lower returns, possibly even negative returns.
A four-year estimate of the total cost is used.
Forecasts of net income for each year and time
19600+20500+24600+16500 = 81200
Average estimate = 81200/4 = $20,300
Now average accounting return
Initial cost /2
185000/2
=$92500
Now the rate = total value/ average value
20300/92500
=21.94%
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