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Custom fields

  1. Hi Guys. does anyone know how to add a percentage to a custom field if its a number?

    So for example my code is;

    <?php echo get_post_meta($post->ID, 'price', true) ?>

    If the value of price is 100 and i want it to automatically add 20% so that the outcome is 120, how is this possible?

    Regards

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