i cant figure out why my answer is wrong. i believe im doing it correctly

Problem 05.013 - Alternative comparison - equal lives 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 $15.00millilon and the M\&O cost is estimated at $1.700 milion per year. Alternatively, if long plastic tubes are used for growing the algae, the initial cost will be higher at $16.00 miltion, but less contamination will render the M\&O cost lower at $0.500 million per year. At an interest rate of 12.00% per year and a 5 year project period. which system is better-ponds or tubes? Use a present worth analysis. (Round the final answers to three decimal places) (include a minus sign if necessary) The present worth of lined ponds is $ million and that of plastic tubes is $ million. are used to grow algac. Problem 05.013 - Alternative comparison - equal lives 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 $15.00millilon and the M\&O cost is estimated at $1.700 milion per year. Alternatively, if long plastic tubes are used for growing the algae, the initial cost will be higher at $16.00 miltion, but less contamination will render the M\&O cost lower at $0.500 million per year. At an interest rate of 12.00% per year and a 5 year project period. which system is better-ponds or tubes? Use a present worth analysis. (Round the final answers to three decimal places) (include a minus sign if necessary) The present worth of lined ponds is $ million and that of plastic tubes is $ million. are used to grow algac