diff --git a/app/Concert.php b/app/Concert.php
index 8dac06b..d1ddb66 100644
--- a/app/Concert.php
+++ b/app/Concert.php
@@ -104,4 +104,14 @@ class Concert extends Model
     {
         return $this->tickets()->sold()->count();
     }
+
+    public function totalTickets()
+    {
+        return $this->tickets()->count();
+    }
+
+    public function percentSoldOut()
+    {
+        return number_format(($this->ticketsSold() / $this->totalTickets()) * 100, 2);
+    }
 }
diff --git a/resources/views/backstage/published-concert-orders/index.blade.php b/resources/views/backstage/published-concert-orders/index.blade.php
index 01b2bcf..afafc82 100644
--- a/resources/views/backstage/published-concert-orders/index.blade.php
+++ b/resources/views/backstage/published-concert-orders/index.blade.php
@@ -25,8 +25,8 @@
             <h2 class="m-xs-b-2 text-lg">Overview</h2>
             <div class="card">
                 <div class="card-section border-b">
-                    <p class="m-xs-b-4">This show is 60% sold out.</p>
-                    <progress class="progress" value="357" max="600">60%</progress>
+                    <p class="m-xs-b-4">This show is {{ $concert->percentSoldOut() }}% sold out.</p>
+                    <progress class="progress" value="{{ $concert->ticketsSold() }}" max="{{ $concert->totalTickets() }}">{{ $concert->percentSoldOut() }}%</progress>
                 </div>
                 <div class="row">
                     <div class="col col-md-4 border-md-r">
diff --git a/tests/Unit/ConcertTest.php b/tests/Unit/ConcertTest.php
index cf2d2b6..a9d62e6 100644
--- a/tests/Unit/ConcertTest.php
+++ b/tests/Unit/ConcertTest.php
@@ -93,6 +93,26 @@ class ConcertTest extends TestCase
 
         $this->assertEquals(3, $concert->ticketsSold());
     }
+
+    /** @test */
+    function total_tickets_includes_all_tickets()
+    {
+        $concert = factory(Concert::class)->create();
+        $concert->tickets()->saveMany(factory(Ticket::class, 3)->create(['order_id' => 1]));
+        $concert->tickets()->saveMany(factory(Ticket::class, 2)->create(['order_id' => null]));
+
+        $this->assertEquals(5, $concert->totalTickets());
+    }
+
+    /** @test */
+    function calculating_the_percentage_of_tickets_sold()
+    {
+        $concert = factory(Concert::class)->create();
+        $concert->tickets()->saveMany(factory(Ticket::class, 2)->create(['order_id' => 1]));
+        $concert->tickets()->saveMany(factory(Ticket::class, 5)->create(['order_id' => null]));
+
+        // $this->assertEquals(0.285714286, $concert->percentSoldOut(), '', 0.00001);
+        $this->assertEquals(28.57, $concert->percentSoldOut());
     }
 
     /** @test */