@@ -0,0 +1,436 @@
+class Grade extends Student %7B%0A   %0A   private int score;%0A    %0A   public Grade( String firstName, String lastName, int phone, int score ) %7B%0A%09%09super( firstName, lastName, phone );%0A%09%09this.score = score;%0A   %7D%0A    %0A   public char calculate() %7B%0A       if ( score %3C 40 ) return 'D';%0A       else if ( score %3C 60 ) return 'B';%0A       else if ( score %3C 75 ) return 'A';%0A       else if ( score %3C 90 ) return 'E';%0A       else return 'O';%0A   %7D%0A   %0A%7D%0A

Add day 12 solution