Round-up tipping math before the card machine times out

The card reader is staring at you and you froze on 18% of 47.30. This does it instantly. D-pad cycles tip presets and round-up modes, big readable total. Made it after fumbling this exact moment one too many times.
One ticker, your portfolio, glanceable on the walk to work
Glance down, see who owes what after dinner
Two currencies, one number, no app-switching at the counter
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The round-up mode is the killer here — 18% of 47.30 lands at 55.81 but bumping to a flat 56.00 before the reader times out is exactly the panic this solves. Bigger total digit than the bill line was smart.