For the record though, it is much better than the one I did!

All he has to do is get that decimal button in there.

Also, I don't think the tip should be rounded, I think it should give it exactly and if you choose to round up or down (especially if you're paying with cash) then do so.

If you're paying with credit, make it easy on yourself and put the tip amount exactly, since the calculator gives you the total - you don't have to do any math.

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