diff --git a/BlueWest.Data/Finance/FinanceTransaction.cs b/BlueWest.Data/Finance/FinanceTransaction.cs
index c7eb582..b218439 100644
--- a/BlueWest.Data/Finance/FinanceTransaction.cs
+++ b/BlueWest.Data/Finance/FinanceTransaction.cs
@@ -8,18 +8,25 @@ namespace BlueWest.Data
     {
         ConsumerTypeBuy,
         ConsumerTypeDonate,
-        BusinessIncomePayment
+        BusinessIncomePayment,
+        BankTransferPayment
     }
 
 
     public class FinanceTransactionType
     {
         [Key] private FinanceTransactionTypeEnum Type;
-        private string FinanceTransactionDescription;
+        private string FinanceTransactionTypeDescription;
+    }
+
+    public enum MathOperationType
+    {
+        Add,
+        Sub,
+        Div,
+        Mul
     }
     
-    
-
     [MapFrom(typeof(FinanceTransactionInsertDto))]
     public partial class FinanceTransaction
     {
@@ -28,9 +35,9 @@ namespace BlueWest.Data
          public TimeSpan UserId { get; set; }
         
          public string Currency { get; }
-         
          public FinanceTransactionType FinanceTransactionType {get;}
          
+         private string FinanceTransactionDescription;
 
 
         public FinanceTransaction()
diff --git a/BlueWest.Data/Finance/MathOperation.cs b/BlueWest.Data/Finance/MathOperation.cs
new file mode 100644
index 0000000..07f7100
--- /dev/null
+++ b/BlueWest.Data/Finance/MathOperation.cs
@@ -0,0 +1,57 @@
+using System;
+using System.ComponentModel.DataAnnotations;
+
+namespace BlueWest.Data;
+
+public class MathOperation
+{
+    [Key] public TimeSpan CreationDate { get; set; }
+    public MathOperationType MathOperationType { get;  }
+        
+    public double LeftAmount { get;  }
+    public double RightAmount { get;  }
+    public string MathOperationDescription { get; }
+
+    private bool _isCalculated = false;
+
+    private double _resultingAmount;
+
+    public double ResultingAmount
+    {
+        get
+        {
+            if (_isCalculated) return _resultingAmount;
+            return 0;
+        }
+    }
+
+    public MathOperation() { }
+    public MathOperation(MathOperationType mathOperationType, double leftAmount, double rightAmount, string mathOperationDescription)
+    {
+        MathOperationType = mathOperationType;
+        LeftAmount = leftAmount;
+        RightAmount = rightAmount;
+        MathOperationDescription = mathOperationDescription;
+    }
+
+    public void Calculate()
+    {
+        _isCalculated = true;
+        
+        switch (MathOperationType)
+        {
+            case MathOperationType.Add:
+                _resultingAmount = LeftAmount + RightAmount;
+                return;
+            case MathOperationType.Div:
+                _resultingAmount = LeftAmount / RightAmount;
+                return;
+            case MathOperationType.Mul:
+                _resultingAmount = LeftAmount * RightAmount;
+                return;
+            case MathOperationType.Sub:
+                _resultingAmount = LeftAmount - RightAmount;
+                return;
+        }
+    }
+}
\ No newline at end of file
diff --git a/BlueWest.sln b/BlueWest.sln
index 9de9c6e..4d58851 100644
--- a/BlueWest.sln
+++ b/BlueWest.sln
@@ -13,6 +13,14 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "BlueWest.Collections", "Blu
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "BlueWest.MapTo", "include\MapTo\src\BlueWest.MapTo\BlueWest.MapTo.csproj", "{72B37540-A12F-466E-A58F-7BA2B247CB74}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SimpleExpressionEvaluator", "include\Math-Expression-Evaluator\SimpleExpressionEvaluator\SimpleExpressionEvaluator.csproj", "{30637214-EDE9-4C2E-BFD6-E4B163FA308B}"
+EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "include", "include", "{A1606EEC-6AC5-4779-B140-F57089F5A05F}"
+EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "data", "data", "{19577B27-7EDF-4DBA-83D5-E047467BDFEF}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SimpleExpressionEvaluator.Tests", "include\Math-Expression-Evaluator\SimpleExpressionEvaluator.Tests\SimpleExpressionEvaluator.Tests.csproj", "{08F4484E-5FD8-4590-A8D7-12FBE47120C8}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -39,6 +47,14 @@ Global
 		{72B37540-A12F-466E-A58F-7BA2B247CB74}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{72B37540-A12F-466E-A58F-7BA2B247CB74}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{72B37540-A12F-466E-A58F-7BA2B247CB74}.Release|Any CPU.Build.0 = Release|Any CPU
+		{30637214-EDE9-4C2E-BFD6-E4B163FA308B}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{30637214-EDE9-4C2E-BFD6-E4B163FA308B}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{30637214-EDE9-4C2E-BFD6-E4B163FA308B}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{30637214-EDE9-4C2E-BFD6-E4B163FA308B}.Release|Any CPU.Build.0 = Release|Any CPU
+		{08F4484E-5FD8-4590-A8D7-12FBE47120C8}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{08F4484E-5FD8-4590-A8D7-12FBE47120C8}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{08F4484E-5FD8-4590-A8D7-12FBE47120C8}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{08F4484E-5FD8-4590-A8D7-12FBE47120C8}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -46,4 +62,11 @@ Global
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {F24E44CA-98BA-4B44-A1E1-57912CC5DCC3}
 	EndGlobalSection
+	GlobalSection(NestedProjects) = preSolution
+		{30637214-EDE9-4C2E-BFD6-E4B163FA308B} = {A1606EEC-6AC5-4779-B140-F57089F5A05F}
+		{72B37540-A12F-466E-A58F-7BA2B247CB74} = {A1606EEC-6AC5-4779-B140-F57089F5A05F}
+		{F55019A2-E2A8-4AF1-8FBC-FA99476A1B1C} = {19577B27-7EDF-4DBA-83D5-E047467BDFEF}
+		{E518C62D-768C-4885-9C9D-FD5761605B54} = {19577B27-7EDF-4DBA-83D5-E047467BDFEF}
+		{08F4484E-5FD8-4590-A8D7-12FBE47120C8} = {A1606EEC-6AC5-4779-B140-F57089F5A05F}
+	EndGlobalSection
 EndGlobal
diff --git a/include/Math-Expression-Evaluator b/include/Math-Expression-Evaluator
new file mode 160000
index 0000000..bc7ff8b
--- /dev/null
+++ b/include/Math-Expression-Evaluator
@@ -0,0 +1 @@
+Subproject commit bc7ff8bced98c9e58ae1b55133909cd76effb210