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Hello! I am currently building a online printing shop where the website should read how many pages a pdf an user sent has. Then, there are dropdowns (aka selects) with stuff like Color (Black or colors printing), Size (A3,A4, Photo), etc… I was trying to get it to increase the price based on the choises.
A concrete example: an user sent a pdf with 3 pages. Then, he choose every page painted black only (0,10€ per page), so it should start a calculation in order to, after all the dropdowns, it shows the user the price of it. How could i achieve this? Thanks for your time