Unfortunately, this question cannot be answered with a blanket answer. An interactive website offers a wide range of design options, from simple buttons that the user just has to click through to elaborate user experiences.
So it always depends on which style you choose, how you want to integrate the interactive elements, how many subpages the main page is divided into, and how elaborate the overall visual appearance is.
Of course, the price also depends a lot on whether you want to have it created yourself with a webpage builder or work with a professional agency.
The more designers and developers are on board, the more expensive it will be. However, a good agency will always try to find a solution for an individual budget. If you are interested in an interactive website, feel free to contact our project managers.