Add percentage

app/controllers/home_controller.rb

@@ -5,6 +5,7 @@ class HomeController < ApplicationController
   def ratings
     @talks = Talk.ordered_by_rating
     @ratings = Ratings.new
+    @votes_count = TalkPreference.count
   end
 
   def export

app/views/home/_talk.html.erb

@@ -4,4 +4,5 @@
   <td><%= talk.title %></td>
   <td><%= talk.subtitle %></td>
   <td><%= @ratings[talk.id] %></td>
+  <td><%= "%.2f%" % Rational(100 * @ratings[talk.id], @votes_count).to_f %></td>
 </tr>

app/views/home/ratings.html.erb

@@ -6,6 +6,7 @@
       <th>Title</th>
       <th>Subtitle</th>
       <th>Votes</th>
+      <th>%</th>
     </tr>
   </thead>
   <tbody>