How do I make a different price if ordering more than one.

One of the elements on my form is selling digital files. I have the first at $45, then want to make any ones after that less money. For example 1. digital file $45, and any other digital files are $30 each. How do I do this?  I have below how my form is set up, and also the calculation wizard in the attachments.

There is an easier way to achieve your by setting the "Calculation Value" of each quantity dropdown option. You can directly pass the calculation value in the form calculation widget without any need of conditions. Please check the screenshot below:

Please take a look at the following cloned form whee I have made the changes and see if this works as expected: https://www.jotform.com/73033184787967

Feel free to clone this form for a closer look. The following guide should help you in form cloning:  https://www.jotform.com/help/42-How-to-Clone-an-Existing-Form-from-a-URL