diff --git a/.idea/.idea.EvoCalculator.Core/.idea/workspace.xml b/.idea/.idea.EvoCalculator.Core/.idea/workspace.xml
index 7050420..8a2cd87 100644
--- a/.idea/.idea.EvoCalculator.Core/.idea/workspace.xml
+++ b/.idea/.idea.EvoCalculator.Core/.idea/workspace.xml
@@ -14,20 +14,9 @@
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+    <setting file="mock://C:/Users/Chika/Projects/EvoCalculator.Core/EvoCalculator.Core.Calculation/Columns/InterestColumn.cs" root0="SKIP_HIGHLIGHTING" />
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+    <setting file="mock://C:/Users/Chika/Projects/EvoCalculator.Core/EvoCalculator.Core/Controllers/v1/CalculationController.cs" root0="SKIP_HIGHLIGHTING" />
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+      <option name="presentableId" value="LOCAL-00013" />
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-    <state width="2517" height="173" key="GridCell.Tab.3.center" timestamp="1606074952370">
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+    <state width="2517" height="173" key="GridCell.Tab.3.center" timestamp="1606076059483">
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-    <state width="2517" height="173" key="GridCell.Tab.3.right" timestamp="1606074952370">
+    <state width="2517" height="173" key="GridCell.Tab.3.left/0.0.2560.1400/2560.0.1920.1040@0.0.2560.1400" timestamp="1606076059483" />
+    <state width="2517" height="173" key="GridCell.Tab.3.right" timestamp="1606076059483">
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+    <state width="2517" height="173" key="GridCell.Tab.4.left" timestamp="1606076059483">
       <screen x="0" y="0" width="2560" height="1400" />
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-    <state width="2517" height="173" key="GridCell.Tab.4.right" timestamp="1606074952370">
+    <state width="2517" height="173" key="GridCell.Tab.4.left/0.0.2560.1400/2560.0.1920.1040@0.0.2560.1400" timestamp="1606076059483" />
+    <state width="2517" height="173" key="GridCell.Tab.4.right" timestamp="1606076059483">
       <screen x="0" y="0" width="2560" height="1400" />
     </state>
     <state width="3029" height="495" key="GridCell.Tab.4.right/0.0.1536.824/-3840.-1059.3072.1688@-3840.-1059.3072.1688" timestamp="1605208200096" />
     <state width="1493" height="321" key="GridCell.Tab.4.right/0.0.1536.824/-3840.-1059.3072.1688@0.0.1536.824" timestamp="1605204563328" />
-    <state width="2517" height="173" key="GridCell.Tab.4.right/0.0.2560.1400/2560.0.1920.1040@0.0.2560.1400" timestamp="1606074952370" />
+    <state width="2517" height="173" key="GridCell.Tab.4.right/0.0.2560.1400/2560.0.1920.1040@0.0.2560.1400" timestamp="1606076059483" />
     <state x="872" y="432" key="Rider.ProjectTemplateDialog.Size" timestamp="1602854431119">
       <screen x="0" y="0" width="2560" height="1400" />
     </state>
@@ -530,10 +529,10 @@
     </state>
     <state x="-3730" y="-948" width="2852" height="1467" key="VCS.FileHistoryDialog/0.0.1536.824/-3840.-1059.3072.1688@-3840.-1059.3072.1688" timestamp="1605207856924" />
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-    <state x="872" y="433" key="Vcs.Push.Dialog.v2" timestamp="1606071901533">
+    <state x="872" y="433" key="Vcs.Push.Dialog.v2" timestamp="1606075250192">
       <screen x="0" y="0" width="2560" height="1400" />
     </state>
-    <state x="872" y="433" key="Vcs.Push.Dialog.v2/0.0.2560.1400/2560.0.1920.1040@0.0.2560.1400" timestamp="1606071901533" />
+    <state x="872" y="433" key="Vcs.Push.Dialog.v2/0.0.2560.1400/2560.0.1920.1040@0.0.2560.1400" timestamp="1606075250192" />
     <state width="1288" height="708" key="XDebugger.FullValuePopup" timestamp="1606066433182">
       <screen x="0" y="0" width="2560" height="1400" />
     </state>
@@ -550,11 +549,11 @@
       <screen x="0" y="0" width="2560" height="1400" />
     </state>
     <state x="192" y="0" width="1099" height="909" key="dock-window-1/0.0.2560.1400/2560.0.1920.1040@0.0.2560.1400" timestamp="1605705406149" />
-    <state x="2834" y="51" width="1137" height="959" key="find.popup" timestamp="1606073536980">
+    <state x="2834" y="51" width="1137" height="959" key="find.popup" timestamp="1606075995500">
       <screen x="2560" y="0" width="1920" height="1040" />
     </state>
     <state x="-2929" y="-765" width="1365" height="1157" key="find.popup/0.0.1536.824/-3840.-1059.3072.1688@-3840.-1059.3072.1688" timestamp="1605205829000" />
-    <state x="2834" y="51" width="1137" height="959" key="find.popup/0.0.2560.1400/2560.0.1920.1040@0.0.2560.1400" timestamp="1606073536980" />
+    <state x="2834" y="51" width="1137" height="959" key="find.popup/0.0.2560.1400/2560.0.1920.1040@0.0.2560.1400" timestamp="1606075995500" />
     <state x="936" y="330" key="run.anything.popup" timestamp="1603290743275">
       <screen x="0" y="0" width="2560" height="1400" />
     </state>
@@ -565,23 +564,6 @@
     <state x="943" y="315" width="672" height="678" key="search.everywhere.popup/0.0.2560.1400/2560.0.1920.1040@0.0.2560.1400" timestamp="1605708756063" />
   </component>
   <component name="XDebuggerManager">
-    <breakpoint-manager>
-      <breakpoints>
-        <line-breakpoint enabled="true" type="DotNet Breakpoints">
-          <url>file://$PROJECT_DIR$/EvoCalculator.Core.Calculation/Columns/CashflowMSFOColumn.cs</url>
-          <line>13</line>
-          <properties documentPath="C:\Users\Chika\Projects\EvoCalculator.Core\EvoCalculator.Core.Calculation\Columns\CashflowMSFOColumn.cs" initialLine="13">
-            <startOffsets>
-              <option value="441" />
-            </startOffsets>
-            <endOffsets>
-              <option value="442" />
-            </endOffsets>
-          </properties>
-          <option name="timeStamp" value="30" />
-        </line-breakpoint>
-      </breakpoints>
-    </breakpoint-manager>
     <pin-to-top-manager>
       <pinned-members>
         <PinnedItemInfo parentTag="Frame#EvoCalculator.Core.Tests.Calculation.Suite.Columns.TLM_GrTests.TLM_GrTest1" memberName="expected" />
diff --git a/EvoCalculator.Core.Calculation/Columns/InterestColumn.cs b/EvoCalculator.Core.Calculation/Columns/InterestColumn.cs
index dfc59ec..59a85de 100644
--- a/EvoCalculator.Core.Calculation/Columns/InterestColumn.cs
+++ b/EvoCalculator.Core.Calculation/Columns/InterestColumn.cs
@@ -11,7 +11,7 @@ namespace EvoCalculator.Core.Calculation.Columns
 
         public void PostCheck(SumColumn sumColumn)
         {
-            for (var i = 0; i < Values.Skip(1).ToList().Count; i++)
+            for (var i = 1; i < Values.Skip(1).ToList().Count; i++)
                 if (Values[i] > sumColumn.Values[i])
                 {
                     throw new Exception(
diff --git a/EvoCalculator.Core/Controllers/v1/CalculationController.cs b/EvoCalculator.Core/Controllers/v1/CalculationController.cs
index c3ebf59..d040c1d 100644
--- a/EvoCalculator.Core/Controllers/v1/CalculationController.cs
+++ b/EvoCalculator.Core/Controllers/v1/CalculationController.cs
@@ -7,6 +7,7 @@ using EvoCalculator.Core.Models.Calculation.Models.Request;
 using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Mvc;
 using Newtonsoft.Json;
+using Newtonsoft.Json.Serialization;
 
 namespace EvoCalculator.Core.Controllers.V1
 {
@@ -322,8 +323,13 @@ namespace EvoCalculator.Core.Controllers.V1
                 };
 
                 Response.ContentType = "application/json";
+
                 await Response.WriteAsync(JsonConvert.SerializeObject(res,
-                    new JsonSerializerSettings {Formatting = Formatting.Indented}));
+                    new JsonSerializerSettings
+                    {
+                        Formatting = Formatting.Indented,
+                        ContractResolver = new CamelCasePropertyNamesContractResolver()
+                    }));
             }
             catch (Exception ex)
             {