Oil from a specific type of marine microalgae can be converted into biodiesel that may serve as an alternate transportable fuel for automobiles and trucks. If lined ponds are used to grow the algae, the construction cost is exist9 million and the M&O cost is estimated at exist1.6 million per year. Alternatively, if long plastic tubes are used for growing the algae, the initial cost will be higher at exist24 million, but less contamination will render the M&O cost lower at exist0. 4 million per year. At an interest rate of 12% per year and a 5-year project period, which system is better-ponds or tubes? Use a present worth analysis. The present worth of lined ponds is exist and that of plastic tubes is exist are used to grow algae