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Pannenkoekenhuis/Strategy/KortingsCalculator.cs

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+using Strategy_Kassabon;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Pannenkoekenhuis.Strategy
+{
+    public abstract class KortingsCalculator
+    {
+        protected Kassabon a;
+
+        public KortingsCalculator(Kassabon a)
+        {
+            this.a = a;
+        }
+
+        public abstract double Korting();
+    }
+}