change

Entities/Contracts/Submission.cs

@@ -34,8 +34,7 @@ namespace Entities.Contracts
 		public DateTime SubmissionTime { get; set; }
 
 		[Column("overall_grade")]
-		[Precision(5, 2)]
-		public decimal? OverallGrade { get; set; }
+		public float? OverallGrade { get; set; }
 
 		[Column("overall_feedback")]
 		public string OverallFeedback { get; set; }