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Five methods could be used to recover grease from a rendering plant wastewater streams, The investment costs and incomes associated with each one are shown in table below. Assuming that all methods have 10 years life with salvage value (class roll number multiplied by 100), determine which one should be selected using a minimum attractive rate of retum of 15% per annum, and use following techniques to select most advantageous approach a) Benefit Cost Ratio b) Internal Rate of Return Description METHODS A B C D E First Cost $ 15,000 19,000 25,000 33,000 18,000 12,000 9,000 11,000 13,000 Operating Cost 10,000 per years Annual 15,000 incomes 20,000 19,000 22.000 27,000