Base
The output appears here. (hopefully...)
The app calculates how much the user is paying per GB per month on a $19.99 50GB post-paid plan based on how many GB the user uses per month. If the user exceeds 50GB, they need to purchase an additional 50GB plan.
Hint: The built-in function Math.ceil is helpful for this exercise.
For example if the user only used 1GB this month, the app would calculate $19.99 per GB. If the user used 2GB this month, the app would calculate $9.98 per GB. If the user used 51GB this month, the app would calculate $0.78 per GB.