My first commit of the app!

main.py

@@ -9,9 +9,22 @@ __flags__ = ['--bootstrap=sdl2', '--requirements=python2,kivy', '--orientation=l
 
 
 class OrderApp(App):
+
+    charge = 9.99
+
     def build(self):
         inspector.create_inspector(Window, self) # For inspection (press control-e to toggle).
 
+    def update_cost(self):
+        if self.root.ids.size_slider.value < 50:
+            self.charge = "10.99"
+            self.root.ids.price.text = self.charge
+        elif self.root.ids.size_slider.value == 50:
+            self.charge = "11.99"
+            self.root.ids.price.text = self.charge
+        elif self.root.ids.size_slider.value > 50:
+            self.charge = "12.99"
+            self.root.ids.price.text = self.charge
 
 if __name__ == '__main__':
     app = OrderApp()

order.kv

 BoxLayout:
     orientation: 'vertical'
     Label:
-        text: '[Your meal-ordering GUI here]'
+        text: 'HuHot'
+        font_size: '42sp'
+        color: [255,0,0,1]
+    BoxLayout:
+        orientation: 'vertical'
+        Label:
+            text: 'Build your meal:'
+    BoxLayout:
+        orientation: 'vertical'
+        Label:
+            text: 'Meats:'
+        BoxLayout:
+            orientation: 'vertical'
+            BoxLayout:
+                orientation: 'horizontal'
+                CheckBox:
+            BoxLayout:
+                orientation: 'horizontal'
+
+                Label:
+                    text: 'Beef'
+                    halign: 'right'
+    BoxLayout:
+        orientation: 'vertical'
+        Label:
+            text: 'Vegetables:'
+    BoxLayout:
+        orientation: 'vertical'
+        Label:
+            text: 'Sauces:'
+    BoxLayout:
+        orientation: 'vertical'
+        Label:
+            text: 'Meal Size'
+        Slider:
+            orientation: 'horizontal'
+            padding: '100sp'
+            step: 50
+            id: size_slider
+            on_value_pos: app.update_cost()
+        Label:
+            text: 'Little Warrier'
+            halign: 'left'
+        Label:
+            text: 'bigger'
+            halign: 'center'
+        Label:
+            text: 'biggest'
+            halign: 'right'
+    BoxLayout:
+        orientation: 'vertical'
+        Label:
+            id: price
+            text: str(app.charge)
+
+