Provide the missing structure(s) or reagent(s) for each reaction or sequences of reactions. Show all relevant stereochemistry.
-Provide missing structure(s): 
Definitions:
Useful Life
Useful life refers to the estimated timeframe during which an asset is expected to be economically usable by an entity, with reasonable efficiency.
Average Rate of Return
A measure of the profitability of an investment, calculated as the average annual profit returned on an investment, expressed as a percentage of the initial investment cost.
Total Net Income
The total amount of earnings left over for a business after all expenses have been deducted from total revenues.
Present Value Factor
A coefficient used to calculate the present value of a future amount of money or stream of cash flows, based on a specific discount rate.
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