I need a formula for showing results on my classifieds website.

I am now done with the paging of records, but this formula for showing results remains.

I want it like this:

  Showing 1-50 of 123 found.

Now what is the formula for this?

I have these variables which should be enough I think:

  $results_per_page = 50; //results per page
  $page = 1; //current page
  Also a variable called $num_total contains the total nr of hits, in this case 123.

Thanks