Used HTML, CSS, JS, Flexbox, and Grid.

This is my first Junior Challenge. I wasn't sure if I should put the logo inside a header or not. In the end I decided not to. I might be wrong but there seems to be a miscalculation on the sample design image. In the sample image, the bill is $142.55 with 15% tip and 5 people sharing. The tip amount is 142.55 * 0.15 / 5 = 4.2765. The sample image rounds it to 4.27. Shouldn't it round it to 4.28?