RainMan Inc. is in the business of producing rain upon request. They must decide between two investment projects; a new airplane for seeding rain clouds or a new weather control machine built by Dr. Nutzbaum. The discount rate for the new airplane is 9%, while the discount rate for the weather machine is 39% (it happens to be higher risk) . Which investment should the company select and why? 
Definitions:
Compounded Semi-annually
The process of adding interest to the principal sum of a deposit or loan every six months, so that each subsequent interest calculation is based on the original principal plus all accumulated interest.
Ordinary Annuity
A series of equal payments made at equal intervals of time, with the first payment occurring at the end of the period.
Present Value
The current value of a future sum of money or stream of cash flows given a specified rate of return.
Compounded Quarterly
The method of calculating interest where the interest is added to the principal sum four times a year.
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