Count content of columns in table symfony2/twig/doctrine - php

Question

So I have this table created with a crud in my symfony2 project. The table displays different products with each their own price. I would like to have a output with the total value of all products at the bottom of the table.
index.html.twig of entity "waarde"
{% extends '::base.html.twig' %}
{% block body -%}
<h1>Waarde voorraad</h1>
<table class="records_list">
<thead>
<tr>
<th>Product</th>
<th>Type</th>
<th>Fabriek</th>
<th>Aantal</th>
<th>Prijs</th>
<th>Inkoop Waarde</th>
<th>Verkoop Waarde</th>
<th>Locatie</th>
<th>Actions</th>
</tr>
</thead>
<tbody>
{% for entity in entities %}
<tr>
<td>{{ entity.getProduct().getNaam() }}</td>
<td>{{ entity.getProduct().getType() }}</td>
<td>{{ entity.getProduct().getFabriek() }}</td>
<td>{{ entity.aantal }}</td>
<td>{{ entity.getProduct().getInkoopprijs() }}</td>
<td>{{ entity.getProduct().getInkoopprijs() * entity.aantal }}</td>
<td>{{ entity.getProduct().getVerkoopprijs() * entity.aantal }}</td>
<td>{{ entity.getLocatie().getLocatienaam() }}</td>
<td>
<ul>
<li>
show
</li>
<li>
edit
</li>
</ul>
</td>
</tr>
{% endfor %}
</tbody>
</table>
<ul>
<li>
<a href="{{ path('waarde_new') }}">
Create a new entry
</a>
</li>
</ul>
{% endblock %}
I have a association between the entities "Product" and "Waarde"(=value).
<td>{{ entity.getProduct().getInkoopprijs() }}</td>
The code above returns the price of a product. I already have done a simple code to calculate the value of a single product by this code ("aantal" = quantity/amount of products)
<td>{{ entity.getProduct().getInkoopprijs() * entity.aantal }}</td>

Answer 1

{% set sum = 0 %}
{% for entity in entities %}
{% set sum = sum + (entity.getProduct().getInkoopprijs() * entity.aantal) %}
{% endfor %}
Total price: {{ sum }}