Answer:
Annual rate of return of building a new salon 15%.
Step-by-step explanation:
We have Annual rate of return = Average Annual Profit / Average Investment;
in which: Average Annual Profit = Average annual revenues - Average annual expenses (including depreciation) = 68,500 - 41,200 = $27,300 ( because annual revenues and annual expenses including depreciation are estimated at the same level through out 15 years of the new salon's useful life).
Average investment = (Original investment + Net book value at the end of investment) /2 = ( 286,000 + 78,000) /2 = $182,000 ( because Net book value at the end of investment is equal to Estimated salvage value at the end of the salon useful life).
Thus, Annual rate of return = 27,300 / 182,000 = 0.15 = 15%.