Fixed project Amounts

My crowdfunding site has a different business model then most.
The base of my services are packages for releasing music albums.
Customers can choose between 4 packages with a fixed amount in Euro's.

To simplify my question. Can you restrict the investment amount to fixed amounts where people can choose from. Maybe visualized by drop down or radio buttons

Published by B. van Geleuken B. van Geleuken on 16 April 2017