diff --git a/src/core/marketplace.cpp b/src/core/marketplace.cpp
index a212363..ea93303 100644
--- a/src/core/marketplace.cpp
+++ b/src/core/marketplace.cpp
@@ -2,6 +2,9 @@
 #include "database.h"
 
 #include <algorithm>
+#include <numeric>
+#include <sstream>
+#include <iomanip>
 
 Marketplace::Marketplace()
 {
@@ -99,4 +102,20 @@ void Marketplace::finishCurrentSale()
     storeToDb();
 }
 
-BasketVec& Marketplace::getBasket() { return basket_; }
\ No newline at end of file
+BasketVec& Marketplace::getBasket() { return basket_; }
+
+int Marketplace::getBasketSumInCent()
+{
+    int sum = std::accumulate(basket_.begin(), basket_.end(), 0,
+                              [](int a, const auto& b) { return a + b->getPrice(); });
+    return sum;
+}
+
+std::string Marketplace::getBasketSumAsString()
+{
+    int sumInCent = getBasketSumInCent();
+    double sumInEuro = sumInCent / 100.0L;
+    std::stringstream sumStream;
+    sumStream << std::fixed << std::setprecision(2) << sumInEuro << " €";
+    return sumStream.str();
+}
\ No newline at end of file
diff --git a/src/core/marketplace.h b/src/core/marketplace.h
index 7b8c4ea..e515686 100644
--- a/src/core/marketplace.h
+++ b/src/core/marketplace.h
@@ -30,6 +30,8 @@ class Marketplace
     int getNextArticleNo();
     int getNumSellersDelete();
     BasketVec& getBasket();
+    int getBasketSumInCent();
+    std::string getBasketSumAsString();
 
     void sortSellers();
     Seller* findSellerWithSellerNo(int sellerNo);
diff --git a/src/gui/mainwindow.cpp b/src/gui/mainwindow.cpp
index fd73bab..1a4df3e 100644
--- a/src/gui/mainwindow.cpp
+++ b/src/gui/mainwindow.cpp
@@ -55,7 +55,10 @@ void MainWindow::on_actionEditSeller_triggered()
 void MainWindow::on_paidButton_triggered()
 {
     if (marketplace_->basketSize() > 0) {
+        QString lastPrice{marketplace_->getBasketSumAsString().c_str()};
         dynamic_cast<BasketModel*>(ui_.basketView->model())->finishSale();
+        ui_.lastPriceLabel1->setText(lastPrice);
+        ui_.lastPriceLabel2->setText(lastPrice);
     }
 }
 
@@ -66,9 +69,7 @@ void MainWindow::on_sellerNoEdit_checkSellerNo()
     auto inputText = ui_.sellerNoEdit->text().toStdString();
 
     if (inputText.empty()) {
-        if (marketplace_->basketSize() > 0) {
-            dynamic_cast<BasketModel*>(ui_.basketView->model())->finishSale();
-        }
+        on_paidButton_triggered();
         return;
     }
 
@@ -76,6 +77,7 @@ void MainWindow::on_sellerNoEdit_checkSellerNo()
     smatch result;
 
     if (!regex_match(inputText, result, pattern)) {
+        ui_.sellerNoEdit->clear();
         return;
     }
 
@@ -139,6 +141,6 @@ void MainWindow::onCancelAllArticlesButtonClicked([[maybe_unused]] bool checked)
             .exec();
     if (dlgResult == QMessageBox::No)
         return;
-        
+
     dynamic_cast<BasketModel*>(ui_.basketView->model())->cancelSale();
 }
\ No newline at end of file
diff --git a/src/gui/mainwindow.ui b/src/gui/mainwindow.ui
index d9f84f0..6491372 100644
--- a/src/gui/mainwindow.ui
+++ b/src/gui/mainwindow.ui
@@ -53,56 +53,31 @@
          <layout class="QHBoxLayout" name="horizontalLayout_4">
           <item>
            <widget class="QLineEdit" name="sellerNoEdit">
-            <property name="palette">
-             <palette>
-              <active>
-               <colorrole role="Base">
-                <brush brushstyle="SolidPattern">
-                 <color alpha="255">
-                  <red>197</red>
-                  <green>255</green>
-                  <blue>169</blue>
-                 </color>
-                </brush>
-               </colorrole>
-              </active>
-              <inactive>
-               <colorrole role="Base">
-                <brush brushstyle="SolidPattern">
-                 <color alpha="255">
-                  <red>197</red>
-                  <green>255</green>
-                  <blue>169</blue>
-                 </color>
-                </brush>
-               </colorrole>
-              </inactive>
-              <disabled>
-               <colorrole role="Base">
-                <brush brushstyle="SolidPattern">
-                 <color alpha="255">
-                  <red>239</red>
-                  <green>239</green>
-                  <blue>239</blue>
-                 </color>
-                </brush>
-               </colorrole>
-              </disabled>
-             </palette>
-            </property>
             <property name="font">
              <font>
+              <pointsize>14</pointsize>
               <weight>75</weight>
               <bold>true</bold>
              </font>
             </property>
-            <property name="placeholderText">
-             <string>Eingabe Verk.-Nr.</string>
+            <property name="toolTip">
+             <string>Geben Sie hier die Verkäufernummer ein</string>
+            </property>
+            <property name="statusTip">
+             <string>Geben Sie hier die Verkäufernummer ein</string>
+            </property>
+            <property name="whatsThis">
+             <string/>
             </property>
            </widget>
           </item>
           <item>
            <widget class="QPushButton" name="paidButton">
+            <property name="font">
+             <font>
+              <pointsize>14</pointsize>
+             </font>
+            </property>
             <property name="text">
              <string>Bezahlt!</string>
             </property>
@@ -320,7 +295,7 @@ drucken</string>
          </widget>
         </item>
         <item>
-         <widget class="QLabel" name="label_6">
+         <widget class="QLabel" name="lastPriceLabel1">
           <property name="font">
            <font>
             <pointsize>20</pointsize>
@@ -341,7 +316,7 @@ drucken</string>
            <string>-,-- €</string>
           </property>
           <property name="alignment">
-           <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
+           <set>Qt::AlignLeading|Qt::AlignLeft|Qt::AlignVCenter</set>
           </property>
           <property name="margin">
            <number>5</number>
@@ -373,7 +348,7 @@ drucken</string>
          </widget>
         </item>
         <item>
-         <widget class="QLabel" name="label_8">
+         <widget class="QLabel" name="lastPriceLabel2">
           <property name="font">
            <font>
             <pointsize>20</pointsize>
@@ -390,6 +365,9 @@ drucken</string>
           <property name="text">
            <string>-,-- €</string>
           </property>
+          <property name="alignment">
+           <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
+          </property>
           <property name="margin">
            <number>5</number>
           </property>