Allow my customers to complete or choose a quantity options

Hello,

I am looking for a simple way, allows my customers to complete or choose a quantity (ex: from 30 to 250 Announcements wedding) and to have the rate that appears in the function of the choice of quantity.

Would you like to help me?

Thank you

Are you referring to the payment field? If yes, here's how to add quantity and other options.

https://www.jotform.com/help/225-How-to-Add-Options-to-Payment-Forms

Or you can create your own calculation using the form calculation widget. Guide: http://www.jotform.com/help/259-How-to-perform-calculation-in-the-form