North Plains Biofuels (NPB) has negotiated a contract with an oil firm to sell 150,000 barrels of ethanol per year, beginning in end of year (EOY) 4. The oil firm will pay NPB $10M annually beginning from EOY0 to EOY3 and then $110 per barrel from EOY4 through EOY13.If NPB an interest rate of 15%, which method should be used to produce The biofuels