Modify existing website in HTML/CSS/PHP

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Modify existing website in HTML/CSS/PHP
Hi, we are a small association who provides to our members tickets for cultural events. For this we use a website. Our first site was created by purchasing a template and modyfying it. Now we want to renew the site, for wich we also purchased a HTML/CSS site template wich is modified by ourselves. We only have a problem with a small part of it, being : the calculation of the total price in a form and afterwards sending al info in the form to a mailadres.
We dont have enough HTML/CSS skills ourselves for getting it fixed, so we are looking for someone who can solve this ( probably ) easy project.
Skills:
HTML
, PHP
, Website Design
, CSS
, Graphic Design

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