The details page is generated by the webassist/plugins/catalog/details.php
you can remove the currency symbol before the price by editing:
Price: <?php echo($WAGLOBAL_CurrencySymbol); ?>
to:
Price: <?php //echo($WAGLOBAL_CurrencySymbol); ?>
I think if you wanted to show a per unit price for the product, you should add it to the Short or Long description field.