How can I do a counter when iterating over results?

[IronBrotherz]

I want to output something like:

1 10,000

2 12,000

3 56,000

But I have no idea how to do a counter with my loop. Right now I have

        {% for sale in sales %}
        <p>{{sale.amount}}</p>
        {% endfor %}

[zcatk]

{% for sale in sales %}

{{loop.index}} {{sale.amount}}

{% endfor %}