Please if you're not entirely familiar, don't take this problem. I have already gotten answers based on good math. I just don't understand why the database is marking them wrong. Someone please explain what step I'm missing in calculating these answers. You can see the numbers i've already gotten to the right of the table and the specific requirements for the problem are printed below the excel table. Thank You.

6 Answer is complete but not entirely correct. ' 1. Required target cost $ 255.87 9 2. New target cost $ 280.8? 9