Hi,
The price of the screen may depend on whether you have a faulty touchscreen panel or a faulty LCD panel as you didn’t say what the problem is.
Here’s the [https://dl.dell.com/topicspdf/latitude-14-7480-laptop_owners-manual_en-us.pdf|owner manual] for the laptop.
It details the necessary pre-requisite steps and procedures to remove both types of panels i.e. just the touchscreen panel and the LCD display panel.
Here’s a link to just one [https://www.laptopscreen.com/English/model/Dell/LATITUDE~14~7480/|supplier] that gives an idea of what types are available and how much they may cost.