diff --git a/Models/budget/study_material.cs b/Models/budget/study_material.cs
index 6bea812..37be7f9 100644
--- a/Models/budget/study_material.cs
+++ b/Models/budget/study_material.cs
@@ -16,10 +16,10 @@ namespace rmutr_report.Models
         public string student { get; set; }
         // public string code { get; set; }
         // public string major { get; set; }
-        public string salaya { get; set; }
-        public string bophitphimuk { get; set; }
-        public string pohchang { get; set; }
-        public string klai_kangwon { get; set; }
+        public decimal? salaya { get; set; }
+        public decimal? bophitphimuk { get; set; }
+        public decimal? pohchang { get; set; }
+        public decimal? klai_kangwon { get; set; }
         public decimal? sum_science { get; set; }
         public decimal? sum_social { get; set; }
         public decimal? cost_science { get; set; }