At first, I didn't get what was asked, I thought it was the "amountPerPerson" and I re-read the question and tested everywhere as to where to place the foregroundColor and I was really having trouble with the syntax... finally i got it.

For those looking for clues : .foregroundColor(tipPercentage == 4 ? .red : .green)

Would you please explain more about the Day 24 Challenge? I have recently joined and I am going through just trying to understand the things. Your, reply will be highly appreciated.