Display total

app/views/expenses/index.html.erb

@@ -15,7 +15,14 @@
       <td><%= expense.amount %></td>
       <td><%= link_to "Show", expense %></td>
       <td><%= link_to "Edit", edit_expense_path(expense) %></td>
+    </tr>
   <% end %>
+  <tr>
+    <td>Total</td>
+    <td><%= @expenses.sum(&:amount) %></td>
+    <td colspan="2"></td>
+  </tr>
+  </table>
 </div>
 
 <%= link_to "New expense", new_expense_path %>